HTMLMediaElement shouldn't call currentTime() when we HAVE_NOTHING.

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 522 matching lines @@
 
     OwnPtr<MediaPlayer> m_player;
     blink::WebLayer* m_webLayer;
 
     MediaPlayer::Preload m_preload;
 
     DisplayMode m_displayMode;
 
     RefPtrWillBeMember<HTMLMediaSource> m_mediaSource;
 
+    // Cached time value. Only valid when ready state is HAVE_METADATA or
+    // higher, otherwise the current time is assumed to be zero.
     mutable double m_cachedTime;
-    mutable double m_cachedTimeWallClockUpdateTime;
-    mutable double m_minimumWallClockTimeToCacheMediaTime;
 
     double m_fragmentStartTime;
     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;
@@ skipping 76 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