Replace HTMLMediaElement::isActive() with Node::inActiveDocument()

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 84 matching lines @@
 
     blink::WebLayer* platformLayer() const;
 
     enum DelayedActionType {
         LoadMediaResource = 1 << 0,
         LoadTextTrackResource = 1 << 1,
         TextTrackChangesNotification = 1 << 2
     };
     void scheduleDelayedAction(DelayedActionType);
 
-    bool isActive() const { return m_active; }
-
     bool hasRemoteRoutes() const { return m_remoteRoutesAvailable; }
     bool isPlayingRemotely() const { return m_playingRemotely; }
 
     // error state
     PassRefPtrWillBeRawPtr<MediaError> error() const;
 
     // network state
     void setSrc(const AtomicString&);
     const KURL& currentSrc() const { return m_currentSrc; }
 
@@ skipping 430 matching lines @@
     double m_fragmentEndTime;
 
     typedef unsigned PendingActionFlags;
     PendingActionFlags m_pendingActionFlags;
 
     // FIXME: MediaElement has way too many state bits.
     bool m_userGestureRequiredForPlay : 1;
     bool m_playing : 1;
     bool m_shouldDelayLoadEvent : 1;
     bool m_haveFiredLoadedData : 1;
-    bool m_active : 1;
     bool m_autoplaying : 1;
     bool m_muted : 1;
     bool m_paused : 1;
     bool m_seeking : 1;
 
     // data has not been loaded since sending a "stalled" event
     bool m_sentStalledEvent : 1;
 
     // time has not changed since sending an "ended" event
     bool m_sentEndEvent : 1;
@@ skipping 65 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