Remove unneeded "using" statements and blink prefixes

Source/core/html/HTMLMediaElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 23 matching lines @@
 #include "platform/Supplementable.h"
 #include "public/platform/WebMediaPlayerClient.h"
 #include "public/platform/WebMimeRegistry.h"
 
 #if ENABLE(WEB_AUDIO)
 #include "platform/audio/AudioSourceProvider.h"
 #include "public/platform/WebAudioSourceProviderClient.h"
 #endif
 
 namespace blink {
-class WebInbandTextTrack;
-class WebLayer;
-}
-
-namespace blink {
 
 #if ENABLE(WEB_AUDIO)
 class AudioSourceProviderClient;
 class WebAudioSourceProvider;
 #endif
 class AudioTrackList;
 class ContentType;
 class CueTimeline;
 class Event;
 class ExceptionState;
 class HTMLSourceElement;
 class HTMLTrackElement;
 class KURL;
 class MediaController;
 class MediaControls;
 class MediaError;
 class HTMLMediaSource;
 class TextTrackContainer;
 class TextTrackList;
 class TimeRanges;
 class URLRegistry;
 class VideoTrackList;
+class WebInbandTextTrack;
+class WebLayer;
 
 class CORE_EXPORT HTMLMediaElement : public HTMLElement, public WillBeHeapSupplementable<HTMLMediaElement>, public ActiveDOMObject, private WebMediaPlayerClient {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElement);
     WILL_BE_USING_PRE_FINALIZER(HTMLMediaElement, dispose);
 public:
     static WebMimeRegistry::SupportsType supportsType(const ContentType&, const String& keySystem = String());
 
     static void setMediaStreamRegistry(URLRegistry*);
     static bool isMediaStreamURL(const String& url);
@@ skipping 548 matching lines @@
 inline bool isHTMLMediaElement(const HTMLElement& element)
 {
     return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } // namespace blink
 
 #endif // HTMLMediaElement_h