Remove FrameViewBase as base class of PluginView.

third_party/WebKit/Source/core/frame/RemoteFrameView.h

 // Copyright 2014 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.
 
 #ifndef RemoteFrameView_h
 #define RemoteFrameView_h
 
 #include "platform/FrameViewBase.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/heap/Handle.h"
@@ skipping 12 matching lines @@
   void SetParent(FrameViewBase*) override;
 
   RemoteFrame& GetFrame() const {
     ASSERT(remote_frame_);
     return *remote_frame_;
   }
 
   void Dispose() override;
   // Override to notify remote frame that its viewport size has changed.
   void FrameRectsChanged() override;
-  void InvalidateRect(const IntRect&) override;
+  void InvalidateRect(const IntRect&);
   void SetFrameRect(const IntRect&) override;
   void Hide() override;
   void Show() override;
   void SetParentVisible(bool) override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit RemoteFrameView(RemoteFrame*);
 
@@ skipping 10 matching lines @@
 
 DEFINE_TYPE_CASTS(RemoteFrameView,
                   FrameViewBase,
                   frameViewBase,
                   frameViewBase->IsRemoteFrameView(),
                   frameViewBase.IsRemoteFrameView());
 
 }  // namespace blink
 
 #endif  // RemoteFrameView_h