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diff --git a/chromium/third_party/WebKit/Source/core/dom/ClassCollection.h b/chromium/third_party/WebKit/Source/core/dom/ClassCollection.h
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+/*
+ * Copyright (C) 2007 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 David Smith (catfish.man@gmail.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 ClassCollection_h
+#define ClassCollection_h
+
+#include "core/dom/Element.h"
+#include "core/dom/SpaceSplitString.h"
+#include "core/html/HTMLCollection.h"
+
+namespace WebCore {
+
+class ClassCollection FINAL : public HTMLCollection {
+public:
+    // classNames argument is an AtomicString because it is common for Elements to share the same class names.
+    // It is also used to construct a SpaceSplitString (m_classNames) and its constructor requires an AtomicString.
+    static PassRefPtrWillBeRawPtr<ClassCollection> create(ContainerNode& rootNode, CollectionType type, const AtomicString& classNames)
+    {
+        ASSERT_UNUSED(type, type == ClassCollectionType);
+        return adoptRefWillBeNoop(new ClassCollection(rootNode, classNames));
+    }
+
+    virtual ~ClassCollection();
+
+    bool elementMatches(const Element&) const;
+
+private:
+    ClassCollection(ContainerNode& rootNode, const AtomicString& classNames);
+
+    SpaceSplitString m_classNames;
+    AtomicString m_originalClassNames;
+};
+
+DEFINE_TYPE_CASTS(ClassCollection, LiveNodeListBase, collection, collection->type() == ClassCollectionType, collection.type() == ClassCollectionType);
+
+inline bool ClassCollection::elementMatches(const Element& testElement) const
+{
+    if (!testElement.hasClass())
+        return false;
+    if (!m_classNames.size())
+        return false;
+    // FIXME: DOM4 allows getElementsByClassName to return non StyledElement.
+    // https://bugs.webkit.org/show_bug.cgi?id=94718
+    if (!testElement.isStyledElement())
+        return false;
+    return testElement.classNames().containsAll(m_classNames);
+}
+
+} // namespace WebCore
+
+#endif // ClassCollection_h