[part 2] Make classes and structures in modules fast-allocated.

Source/modules/mediasource/HTMLVideoElementMediaSource.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #include "config.h"
 #include "modules/mediasource/HTMLVideoElementMediaSource.h"
 
 #include "core/html/HTMLVideoElement.h"
 #include "modules/mediasource/VideoPlaybackQuality.h"
 
 namespace blink {
 
-HTMLVideoElementMediaSource::HTMLVideoElementMediaSource() { }
-
-HTMLVideoElementMediaSource::~HTMLVideoElementMediaSource() { }
-
 VideoPlaybackQuality* HTMLVideoElementMediaSource::getVideoPlaybackQuality(HTMLVideoElement& videoElement)
 {
     unsigned total = 0;
     unsigned dropped = 0;
     unsigned corrupted = 0;
     WebMediaPlayer* webMediaPlayer = videoElement.webMediaPlayer();
     if (webMediaPlayer) {
         total = webMediaPlayer->decodedFrameCount();
         dropped = webMediaPlayer->droppedFrameCount();
         corrupted = webMediaPlayer->corruptedFrameCount();
     }
 
     return VideoPlaybackQuality::create(videoElement.document(), total, dropped, corrupted);
 }
 
 } // namespace blink