Move Frame pointer to be held by DOMWindow base class.

third_party/WebKit/Source/core/frame/LocalDOMWindow.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 64 matching lines @@
 
   static Document* createDocument(const String& mimeType,
                                   const DocumentInit&,
                                   bool forceXHTML);
   static LocalDOMWindow* create(LocalFrame& frame) {
     return new LocalDOMWindow(frame);
   }
 
   ~LocalDOMWindow() override;
 
+  LocalFrame* frame() const { return toLocalFrame(DOMWindow::frame()); }
+
   DECLARE_VIRTUAL_TRACE();
   DECLARE_VIRTUAL_TRACE_WRAPPERS();
 
   Document* installNewDocument(const String& mimeType,
                                const DocumentInit&,
                                bool forceXHTML = false);
 
   // EventTarget overrides:
   ExecutionContext* getExecutionContext() const override;
   const LocalDOMWindow* toLocalDOMWindow() const override;
   LocalDOMWindow* toLocalDOMWindow() override;
 
   // DOMWindow overrides:
-  LocalFrame* frame() const override;
   Screen* screen() const override;
   History* history() const override;
   BarProp* locationbar() const override;
   BarProp* menubar() const override;
   BarProp* personalbar() const override;
   BarProp* scrollbars() const override;
   BarProp* statusbar() const override;
   BarProp* toolbar() const override;
   Navigator* navigator() const override;
   bool offscreenBuffering() const override;
@@ skipping 144 matching lines @@
   void warnUnusedPreloads(TimerBase*);
 
   explicit LocalDOMWindow(LocalFrame&);
   void dispose();
 
   void dispatchLoadEvent();
   void clearDocument();
 
   void willDetachFrameHost();
 
-  Member<LocalFrame> m_frame;
   Member<Document> m_document;
   Member<DOMVisualViewport> m_visualViewport;
   TaskRunnerTimer<LocalDOMWindow> m_unusedPreloadsTimer;
 
   bool m_shouldPrintWhenFinishedLoading;
 
   HeapHashSet<WeakMember<DOMWindowProperty>> m_properties;
 
   mutable Member<Screen> m_screen;
   mutable Member<History> m_history;
@@ skipping 29 matching lines @@
   return m_status;
 }
 
 inline String LocalDOMWindow::defaultStatus() const {
   return m_defaultStatus;
 }
 
 }  // namespace blink
 
 #endif  // LocalDOMWindow_h