Introduce the abstract class WebViewBase, to decouple WebViewImpl.

third_party/WebKit/Source/web/WebFrameWidgetBase.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "web/WebFrameWidgetBase.h"
 
 #include "core/dom/DocumentUserGestureToken.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/VisualViewport.h"
 #include "core/input/EventHandler.h"
@@ skipping 204 matching lines @@
   drag_operation_ = static_cast<WebDragOperation>(drop_effect);
 
   return drag_operation_;
 }
 
 WebPoint WebFrameWidgetBase::ViewportToRootFrame(
     const WebPoint& point_in_viewport) const {
   return GetPage()->GetVisualViewport().ViewportToRootFrame(point_in_viewport);
 }
 
-WebViewImpl* WebFrameWidgetBase::View() const {
+WebViewBase* WebFrameWidgetBase::View() const {
   return ToWebLocalFrameImpl(LocalRoot())->ViewImpl();
 }
 
 Page* WebFrameWidgetBase::GetPage() const {
   return View()->GetPage();
 }
 
 void WebFrameWidgetBase::DidAcquirePointerLock() {
   GetPage()->GetPointerLockController().DidAcquirePointerLock();
 }
@@ skipping 39 matching lines @@
 
   if (GetPage()) {
     WebMouseEvent transformed_event = TransformWebMouseEvent(
         ToWebLocalFrameImpl(LocalRoot())->GetFrameView(), mouse_event);
     GetPage()->GetPointerLockController().DispatchLockedMouseEvent(
         transformed_event, event_type);
   }
 }
 
 }  // namespace blink