Explicit management of FrameSelection availability

third_party/WebKit/Source/core/editing/FrameCaret.h

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * 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
@@ skipping 44 matching lines @@
     IntRect absoluteCaretBounds();
 
     bool shouldShowBlockCursor() const { return m_shouldShowBlockCursor; }
     void setShouldShowBlockCursor(bool);
 
     void paintCaret(GraphicsContext&, const LayoutPoint&);
 
     void dataWillChange(const CharacterData&);
     void nodeWillBeRemoved(Node&);
 
-    void prepareForDestruction();
+    void documentDetached();
 
     // For unittests
     bool shouldPaintCaretForTesting() const { return m_shouldPaintCaret; }
     bool isPreviousCaretDirtyForTesting() const { return m_previousCaretNode; }
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     bool shouldBlinkCaret() const;
     void caretBlinkTimerFired(Timer<FrameCaret>*);
     bool caretPositionIsValidForDocument(const Document&) const;
 
     PositionWithAffinity m_caretPosition;
     const Member<LocalFrame> m_frame;
     // The last node which painted the caret. Retained for clearing the old
     // caret when it moves.
     Member<Node> m_previousCaretNode;
     LayoutRect m_previousCaretRect;
     CaretVisibility m_previousCaretVisibility;
     Timer<FrameCaret> m_caretBlinkTimer;
     bool m_caretRectDirty : 1;
     bool m_shouldPaintCaret : 1;
     bool m_isCaretBlinkingSuspended : 1;
     bool m_shouldShowBlockCursor : 1;
 };
 
 } // namespace blink
 
 #endif // FrameCaret_h