Introduce the abstract class WebViewBase, to decouple WebViewImpl.

third_party/WebKit/Source/web/EditorClientImpl.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 19 matching lines @@
 
 #ifndef EditorClientImpl_h
 #define EditorClientImpl_h
 
 #include "core/page/EditorClient.h"
 #include "platform/wtf/Forward.h"
 
 namespace blink {
 
 class LocalFrame;
-class WebViewImpl;
+class WebViewBase;
 
 class EditorClientImpl final : public EditorClient {
  public:
-  explicit EditorClientImpl(WebViewImpl*);
+  explicit EditorClientImpl(WebViewBase*);
   ~EditorClientImpl() override;
 
   void RespondToChangedContents() override;
   void RespondToChangedSelection(LocalFrame*, SelectionType) override;
   bool CanCopyCut(LocalFrame*, bool default_value) const override;
   bool CanPaste(LocalFrame*, bool default_value) const override;
   bool HandleKeyboardEvent(LocalFrame*) override;
 
  private:
-  WebViewImpl* web_view_;
+  WebViewBase* web_view_;
 };
 
 }  // namespace blink
 
 #endif