Pass implementation object to supplemental classes by reference

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 22 matching lines @@
 
 #include "core/html/HTMLVideoElement.h"
 #include "modules/mediasource/VideoPlaybackQuality.h"
 
 namespace WebCore {
 
 HTMLVideoElementMediaSource::HTMLVideoElementMediaSource() { }
 
 HTMLVideoElementMediaSource::~HTMLVideoElementMediaSource() { }
 
-PassRefPtrWillBeRawPtr<VideoPlaybackQuality> HTMLVideoElementMediaSource::getVideoPlaybackQuality(HTMLVideoElement* videoElement)
+PassRefPtrWillBeRawPtr<VideoPlaybackQuality> HTMLVideoElementMediaSource::getVideoPlaybackQuality(HTMLVideoElement& videoElement)
 {
     unsigned total = 0;
     unsigned dropped = 0;
     unsigned corrupted = 0;
-    MediaPlayer* player = videoElement->player();
+    MediaPlayer* player = videoElement.player();
     if (player) {
         total = player->decodedFrameCount();
         dropped = player->droppedFrameCount();
         corrupted = player->corruptedFrameCount();
     }
 
-    return VideoPlaybackQuality::create(videoElement->document(), total, dropped, corrupted);
+    return VideoPlaybackQuality::create(videoElement.document(), total, dropped, corrupted);
 }
 
 }