Fix some chromium-style warnings in webrtc/test/

BUG=163
R=phoglund@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1907004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4428 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/test/testsupport/frame_reader.h b/webrtc/test/testsupport/frame_reader.h
index 78cf8d6e..8f88a89 100644
--- a/webrtc/test/testsupport/frame_reader.h
+++ b/webrtc/test/testsupport/frame_reader.h
@@ -54,11 +54,11 @@
   //                           For YUV this is 3 * width * height / 2
   FrameReaderImpl(std::string input_filename, size_t frame_length_in_bytes);
   virtual ~FrameReaderImpl();
-  bool Init();
-  bool ReadFrame(uint8_t* source_buffer);
-  void Close();
-  size_t FrameLength() { return frame_length_in_bytes_; }
-  int NumberOfFrames() { return number_of_frames_; }
+  virtual bool Init() OVERRIDE;
+  virtual bool ReadFrame(uint8_t* source_buffer) OVERRIDE;
+  virtual void Close() OVERRIDE;
+  virtual size_t FrameLength() OVERRIDE;
+  virtual int NumberOfFrames() OVERRIDE;
 
  private:
   std::string input_filename_;