Refactor the PlatformContext layer to have only one class.

webkit/glue/webframe_impl.h

 /*
  * Copyright (C) 2006 Apple Computer, 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 43 matching lines @@
 class Frame;
 class FrameView;
 class HistoryItem;
 class Node;
 class Range;
 class SubstituteData;
 struct WindowFeatures;
 }
 
 namespace gfx {
-class BitmapPlatformDeviceWin;
+class BitmapPlatformDevice;
 }
 
 // Implementation of WebFrame, note that this is a reference counted object.
 class WebFrameImpl : public WebFrame, public base::RefCounted<WebFrameImpl> {
  public:
   WebFrameImpl();
   ~WebFrameImpl();
 
   static int live_object_count() {
     return live_object_count_;
@@ skipping 336 matching lines @@
   // The input fields that are interested in edit events and their associated
   // listeners.
   typedef HashMap<RefPtr<WebCore::HTMLInputElement>,
       webkit_glue::PasswordAutocompleteListener*> PasswordListenerMap;
   PasswordListenerMap password_listeners_;
 
   DISALLOW_COPY_AND_ASSIGN(WebFrameImpl);
 };
 
 #endif  // WEBKIT_GLUE_WEBFRAME_IMPL_H_