Add a layer of indirection between Frame and Page

Source/web/WebFrameImpl.h

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 220 matching lines @@
     virtual WebString contentAsText(size_t maxChars) const;
     virtual WebString contentAsMarkup() const;
     virtual WebString renderTreeAsText(RenderAsTextControls toShow = RenderAsTextNormal) const;
     virtual WebString markerTextForListItem(const WebElement&) const;
     virtual WebRect selectionBoundsRect() const;
 
     virtual bool selectionStartHasSpellingMarkerFor(int from, int length) const;
     virtual WebString layerTreeAsText(bool showDebugInfo = false) const;
 
     // WebCore::FrameDestructionObserver methods.
-    virtual void willDetachPage();
+    virtual void willDetachFrameHost();
 
     static WebFrameImpl* create(WebFrameClient*);
     // FIXME: Move the embedderIdentifier concept fully to the embedder and
     // remove this factory method.
     static WebFrameImpl* create(WebFrameClient*, long long embedderIdentifier);
     virtual ~WebFrameImpl();
 
     // Called by the WebViewImpl to initialize the main frame for the page.
     void initializeAsMainFrame(WebCore::Page*);
 
@@ skipping 270 matching lines @@
     // Stores the additional input events offset and scale when device metrics emulation is enabled.
     WebCore::IntSize m_inputEventsOffsetForEmulation;
     float m_inputEventsScaleFactorForEmulation;
 };
 
 DEFINE_TYPE_CASTS(WebFrameImpl, WebFrame, frame, true, true);
 
 } // namespace blink
 
 #endif