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diff --git a/chromium/third_party/WebKit/Source/core/loader/HistoryController.h b/chromium/third_party/WebKit/Source/core/loader/HistoryController.h
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-/*
- * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
- * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
- *     its contributors may be used to endorse or promote products derived
- *     from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef HistoryController_h
-#define HistoryController_h
-
-#include "core/history/HistoryItem.h"
-#include "core/loader/FrameLoaderTypes.h"
-#include "wtf/HashMap.h"
-#include "wtf/Noncopyable.h"
-#include "wtf/RefPtr.h"
-#include "wtf/text/WTFString.h"
-
-namespace WebCore {
-
-class Frame;
-class HistoryEntry;
-class Page;
-
-
-// A guide to history state in Blink:
-//
-// HistoryController: Owned by Page, is the entry point for interacting with history.
-//     Handles most of the operations to modify history state, navigate to an existing
-//     back/forward entry, etc.
-// HistoryEntry: Represents a single entry in the back/forward list, encapsulating
-//     all frames in the page it represents. It provides access to each frame's
-//     state via lookups by frame id or frame name.
-// HistoryNode: Represents a single frame in a HistoryEntry. Owned by a HistoryEntry. HistoryNodes
-// form a tree that mirrors the FrameTree in the corresponding page. HistoryNodes represent
-// the structure of the page, but don't hold any per-frame state except a list of child frames.
-// HistoryItem (lives in a separate file): The state for a given frame. Can persist across
-//     navigations. HistoryItem is reference counted, and each HistoryNode holds a reference
-//     to its single corresponding HistoryItem. Can be referenced by multiple HistoryNodes and
-//     can therefore exist in multiple HistoryEntry instances.
-//
-// Suppose we have the following page, foo.com, which embeds foo.com/a in an iframe:
-//
-// HistoryEntry 0:
-//     HistoryNode 0_0 (HistoryItem A (url: foo.com))
-//         HistoryNode 0_1: (HistoryItem B (url: foo.com/a))
-//
-// Now we navigation the top frame to bar.com, which embeds bar.com/b and bar.com/c in iframes,
-// and bar.com/b in turn embeds bar.com/d. We will create a new HistoryEntry with a tree
-// containing 4 new HistoryNodes. The state will be:
-//
-// HistoryEntry 1:
-//     HistoryNode 1_0 (HistoryItem C (url: bar.com))
-//         HistoryNode 1_1: (HistoryItem D (url: bar.com/b))
-//             HistoryNode 1_3: (HistoryItem F (url: bar.com/d))
-//         HistoryNode 1_2: (HistoryItem E (url: bar.com/c))
-//
-//
-// Finally, we navigate the first subframe from bar.com/b to bar.com/e, which embeds bar.com/f.
-// We will create a new HistoryEntry and new HistoryNode for each frame. Any frame that
-// navigates (bar.com/e and its child, bar.com/f) will receive a new HistoryItem. However,
-// 2 frames were not navigated (bar.com and bar.com/c), so those two frames will reuse the
-// existing HistoryItem:
-//
-// HistoryEntry 2:
-//     HistoryNode 2_0 (HistoryItem C (url: bar.com))  *REUSED*
-//         HistoryNode 2_1: (HistoryItem G (url: bar.com/e))
-//            HistoryNode 2_3: (HistoryItem H (url: bar.com/f))
-//         HistoryNode 2_2: (HistoryItem E (url: bar.com/c)) *REUSED*
-//
-
-class HistoryNode {
-public:
-    static PassOwnPtr<HistoryNode> create(HistoryEntry*, HistoryItem*);
-    ~HistoryNode() { }
-
-    HistoryNode* addChild(PassRefPtr<HistoryItem>);
-    PassOwnPtr<HistoryNode> cloneAndReplace(HistoryEntry*, HistoryItem* newItem, bool clipAtTarget, Frame* targetFrame, Frame* currentFrame);
-    HistoryItem* value() { return m_value.get(); }
-    void updateValue(PassRefPtr<HistoryItem> item) { m_value = item; }
-    const Vector<OwnPtr<HistoryNode> >& children() const { return m_children; }
-    void removeChildren();
-
-private:
-    HistoryNode(HistoryEntry*, HistoryItem*);
-
-    HistoryEntry* m_entry;
-    Vector<OwnPtr<HistoryNode> > m_children;
-    RefPtr<HistoryItem> m_value;
-};
-
-class HistoryEntry {
-public:
-    static PassOwnPtr<HistoryEntry> create(HistoryItem* root);
-    PassOwnPtr<HistoryEntry> cloneAndReplace(HistoryItem* newItem, bool clipAtTarget, Frame* targetFrame, Page*);
-
-    HistoryNode* historyNodeForFrame(Frame*);
-    HistoryItem* itemForFrame(Frame*);
-    HistoryItem* root() const { return m_root->value(); }
-    HistoryNode* rootHistoryNode() const { return m_root.get(); }
-
-private:
-    friend class HistoryNode;
-
-    HistoryEntry() { }
-    explicit HistoryEntry(HistoryItem* root);
-
-    OwnPtr<HistoryNode> m_root;
-    HashMap<uint64_t, HistoryNode*> m_framesToItems;
-    HashMap<String, HistoryNode*> m_uniqueNamesToItems;
-};
-
-class HistoryController {
-    WTF_MAKE_NONCOPYABLE(HistoryController);
-public:
-    explicit HistoryController(Page*);
-    ~HistoryController();
-
-    // Should only be called by embedder. To request a back/forward
-    // navigation, call FrameLoaderClient::navigateBackForward().
-    void goToItem(HistoryItem*);
-
-    void updateBackForwardListForFragmentScroll(Frame*, HistoryItem*);
-    void updateForCommit(Frame*, HistoryItem*);
-
-    PassRefPtr<HistoryItem> currentItemForExport();
-    PassRefPtr<HistoryItem> previousItemForExport();
-    PassRefPtr<HistoryItem> provisionalItemForExport();
-    HistoryItem* itemForNewChildFrame(Frame*) const;
-    void removeChildrenForRedirect(Frame*);
-
-    bool inSameDocumentLoad() const { return !m_sameDocumentLoadsInProgress.isEmpty() && m_differentDocumentLoadsInProgress.isEmpty(); }
-
-    void setDefersLoading(bool);
-
-private:
-    void goToEntry(PassOwnPtr<HistoryEntry>);
-    void recursiveGoToEntry(Frame*);
-
-    void updateForInitialLoadInChildFrame(Frame*, HistoryItem*);
-    void createNewBackForwardItem(Frame*, HistoryItem*, bool doClip);
-
-    Page* m_page;
-
-    OwnPtr<HistoryEntry> m_currentEntry;
-    OwnPtr<HistoryEntry> m_previousEntry;
-    OwnPtr<HistoryEntry> m_provisionalEntry;
-
-    typedef HashMap<Frame*, RefPtr<HistoryItem> > HistoryFrameLoadSet;
-    HistoryFrameLoadSet m_sameDocumentLoadsInProgress;
-    HistoryFrameLoadSet m_differentDocumentLoadsInProgress;
-
-    bool m_defersLoading;
-    RefPtr<HistoryItem> m_deferredItem;
-};
-
-} // namespace WebCore
-
-#endif // HistoryController_h