Remove dead paint flush tracking code.

content/renderer/render_view_impl.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_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 509 matching lines @@
 
   void RenderWidgetDidSetColorProfile(
       const std::vector<char>& color_profile) override;
   void RenderWidgetFocusChangeComplete() override;
   bool DoesRenderWidgetHaveTouchEventHandlersAt(
       const gfx::Point& point) const override;
   bool RenderWidgetWillHandleGestureEvent(
       const blink::WebGestureEvent& event) override;
   bool RenderWidgetWillHandleMouseEvent(
       const blink::WebMouseEvent& event) override;
-  void RenderWidgetDidFlushPaint() override;
 
   // Old WebFrameClient implementations ----------------------------------------
 
   // RenderViewImpl used to be a WebFrameClient, but now RenderFrameImpl is the
   // WebFrameClient. However, many implementations of WebFrameClient methods
   // still live here and are called from RenderFrameImpl. These implementations
   // are to be moved to RenderFrameImpl <http://crbug.com/361761>.
 
   void didChangeIcon(blink::WebLocalFrame*, blink::WebIconURL::Type);
 
@@ skipping 360 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_