Introduce the abstract class WebViewBase, to decouple WebViewImpl.

third_party/WebKit/Source/web/ContextMenuClientImpl.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 ContextMenuClientImpl_h
 #define ContextMenuClientImpl_h
 
 #include "core/page/ContextMenuClient.h"
 
 namespace blink {
 
 class Document;
 class Editor;
-class WebViewImpl;
+class WebViewBase;
 struct WebContextMenuData;
 
 class ContextMenuClientImpl final : public ContextMenuClient {
  public:
-  explicit ContextMenuClientImpl(WebViewImpl* web_view) : web_view_(web_view) {}
+  explicit ContextMenuClientImpl(WebViewBase* web_view) : web_view_(web_view) {}
   ~ContextMenuClientImpl() override {}
   bool ShowContextMenu(const ContextMenu*, bool from_touch) override;
   void ClearContextMenu() override;
 
  private:
   void PopulateCustomMenuItems(const ContextMenu*, WebContextMenuData*);
   static int ComputeEditFlags(Document&, Editor&);
   bool ShouldShowContextMenuFromTouch(const blink::WebContextMenuData&);
-  WebViewImpl* web_view_;
+  WebViewBase* web_view_;
 };
 
 }  // namespace blink
 
 #endif  // ContextMenuClientImpl_h