Remove unused VideoFrameCapturer::size_most_recent() method.

remoting/capturer/video_frame_capturer.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 REMOTING_CAPTURER_VIDEO_FRAME_CAPTURER_H_
 #define REMOTING_CAPTURER_VIDEO_FRAME_CAPTURER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/shared_memory.h"
@@ skipping 89 matching lines @@
   virtual void InvalidateRegion(const SkRegion& invalid_region) = 0;
 
   // Captures the screen data associated with each of the accumulated
   // dirty region. When the capture is complete, the delegate is notified even
   // if the dirty region is empty.
   //
   // It is OK to call this method while another thread is reading
   // data of the previous capture. There can be at most one concurrent read
   // going on when this method is called.
   virtual void CaptureFrame() = 0;
-
-  // Get the size of the most recently captured screen.
-  virtual const SkISize& size_most_recent() const = 0;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CAPTURER_VIDEO_FRAME_CAPTURER_H_