Make FrameDestructionObserver::m_frame a private.

Source/core/storage/StorageArea.cpp

 /*
  * Copyright (C) 2009 Google Inc. All Rights Reserved.
  *           (C) 2008 Apple Inc.
  *
  * 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 125 matching lines @@
 }
 
 bool StorageArea::canAccessStorage(LocalFrame* frame)
 {
     if (!frame || !frame->page())
         return false;
 
     // FrameDestructionObserver is used to safely keep the cached
     // reference to the LocalFrame. Should the LocalFrame die before
     // this StorageArea does, that cached reference will be cleared.
-    if (m_frame == frame)
+    if (this->frame() == frame)
         return m_canAccessStorageCachedResult;
     StorageNamespaceController* controller = StorageNamespaceController::from(frame->page());
     if (!controller)
         return false;
     bool result = controller->storageClient()->canAccessStorage(frame, m_storageType);
     // Move attention to the new LocalFrame.
     observeFrame(frame);
     m_canAccessStorageCachedResult = result;
     return result;
 }
@@ skipping 55 matching lines @@
 }
 
 bool StorageArea::isEventSource(Storage* storage, WebStorageArea* sourceAreaInstance)
 {
     ASSERT(storage);
     StorageArea* area = storage->area();
     return area->m_storageArea == sourceAreaInstance;
 }
 
 } // namespace blink