Remove dead WebCompositorInputHandler related code

content/public/renderer/render_view_observer.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_
 #define CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "content/common/content_export.h"
@@ skipping 67 matching lines @@
   virtual void PrintPage(WebKit::WebFrame* frame, bool user_initiated) {}
   virtual void FocusedNodeChanged(const WebKit::WebNode& node) {}
   virtual void WillCreateMediaPlayer(WebKit::WebFrame* frame,
                                      WebKit::WebMediaPlayerClient* client) {}
   virtual void ZoomLevelChanged() {};
   virtual void DidChangeScrollOffset(WebKit::WebFrame* frame) {}
   virtual void DraggableRegionsChanged(WebKit::WebFrame* frame) {}
   virtual void DidRequestShowContextMenu(
       WebKit::WebFrame* frame,
       const WebKit::WebContextMenuData& data) {}
-  virtual void DidActivateCompositor(int input_handler_id) {}
   virtual void DidCommitCompositorFrame() {}
 
   // These match the RenderView methods.
   virtual void DidHandleMouseEvent(const WebKit::WebMouseEvent& event) {}
   virtual void DidHandleTouchEvent(const WebKit::WebTouchEvent& event) {}
   virtual void DidHandleGestureEvent(const WebKit::WebGestureEvent& event) {}
   virtual void DidCreatePepperPlugin(RendererPpapiHost* host) {}
 
   // These match incoming IPCs.
   virtual void Navigate(const GURL& url) {}
@@ skipping 22 matching lines @@
   RenderView* render_view_;
   // The routing ID of the associated RenderView.
   int routing_id_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_RENDER_VIEW_OBSERVER_H_