Remove unused VideoFrameCapturer::size_most_recent() method.

remoting/capturer/video_frame_capturer_linux.cc

Index: remoting/capturer/video_frame_capturer_linux.cc
diff --git a/remoting/capturer/video_frame_capturer_linux.cc b/remoting/capturer/video_frame_capturer_linux.cc
index c3f33af2bc2f3573d26b79c7b8d24a2371a52636..edfa1a436a8ccc143fe1dda9a079b7723326a960 100644
--- a/remoting/capturer/video_frame_capturer_linux.cc
+++ b/remoting/capturer/video_frame_capturer_linux.cc
@@ -62,7 +62,6 @@ class VideoFrameCapturerLinux : public VideoFrameCapturer {
   virtual void Stop() OVERRIDE;
   virtual void InvalidateRegion(const SkRegion& invalid_region) OVERRIDE;
   virtual void CaptureFrame() OVERRIDE;
-  virtual const SkISize& size_most_recent() const OVERRIDE;
 
  private:
   void InitXDamage();
@@ -589,10 +588,6 @@ void VideoFrameCapturerLinux::SlowBlit(uint8* image, const SkIRect& rect,
   }
 }
 
-const SkISize& VideoFrameCapturerLinux::size_most_recent() const {
-  return helper_.size_most_recent();
-}
-
 }  // namespace
 
 // static