Introduce the abstract class WebViewBase, to decouple WebViewImpl.

third_party/WebKit/Source/web/ExternalPopupMenu.h

 /*
  * Copyright (C) 2010 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 28 matching lines @@
 #include "public/platform/WebScrollbar.h"
 #include "public/web/WebExternalPopupMenuClient.h"
 #include "web/WebExport.h"
 
 namespace blink {
 
 class HTMLSelectElement;
 class LocalFrame;
 class WebExternalPopupMenu;
 class WebMouseEvent;
-class WebViewImpl;
+class WebView;
 struct WebPopupMenuInfo;
 
 // The ExternalPopupMenu connects the actual implementation of the popup menu
 // to the WebCore popup menu.
 class WEB_EXPORT ExternalPopupMenu final : NON_EXPORTED_BASE(public PopupMenu),
                                            public WebExternalPopupMenuClient {
  public:
-  ExternalPopupMenu(LocalFrame&, HTMLSelectElement&, WebViewImpl&);
+  ExternalPopupMenu(LocalFrame&, HTMLSelectElement&, WebView&);
   ~ExternalPopupMenu() override;
 
   // Fills |info| with the popup menu information contained in the
   // PopupMenuClient associated with this ExternalPopupMenu.
   // FIXME: public only for test access. Need to revert once gtest
   // helpers from chromium are available for blink.
   static void GetPopupMenuInfo(WebPopupMenuInfo&, HTMLSelectElement&);
   static int ToPopupMenuItemIndex(int index, HTMLSelectElement&);
   static int ToExternalPopupMenuItemIndex(int index, HTMLSelectElement&);
 
@@ skipping 11 matching lines @@
   void DidAcceptIndex(int index) override;
   void DidAcceptIndices(const WebVector<int>& indices) override;
   void DidCancel() override;
 
   bool ShowInternal();
   void DispatchEvent(TimerBase*);
   void Update();
 
   Member<HTMLSelectElement> owner_element_;
   Member<LocalFrame> local_frame_;
-  WebViewImpl& web_view_;
+  WebView& web_view_;
   std::unique_ptr<WebMouseEvent> synthetic_event_;
   TaskRunnerTimer<ExternalPopupMenu> dispatch_event_timer_;
   // The actual implementor of the show menu.
   WebExternalPopupMenu* web_external_popup_menu_;
   bool needs_update_ = false;
 };
 
 }  // namespace blink
 
 #endif  // ExternalPopupMenu_h