1 files changed, 5 insertions, 3 deletions
diff --git a/chromium/third_party/WebKit/Source/core/editing/UndoStep.h b/chromium/third_party/WebKit/Source/core/editing/UndoStep.h
index 3084946773b..1502e975349 100644
--- a/chromium/third_party/WebKit/Source/core/editing/UndoStep.h
+++ b/chromium/third_party/WebKit/Source/core/editing/UndoStep.h
@@ -32,17 +32,19 @@
 #define UndoStep_h
 
 #include "core/editing/EditAction.h"
+#include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
-class Frame;
+class LocalFrame;
 
-class UndoStep : public RefCounted<UndoStep> {
+class UndoStep : public RefCountedWillBeGarbageCollectedFinalized<UndoStep> {
 public:
     virtual ~UndoStep() { }
+    virtual void trace(Visitor*) { }
 
-    virtual bool belongsTo(const Frame&) const = 0;
+    virtual bool belongsTo(const LocalFrame&) const = 0;
     virtual void unapply() = 0;
     virtual void reapply() = 0;
     virtual EditAction editingAction() const = 0;