Eliminate MediaPlayer & MediaPlayerClient abstractions(seek, duration, poster APIs)

Source/platform/graphics/media/MediaPlayer.h

Index: Source/platform/graphics/media/MediaPlayer.h
diff --git a/Source/platform/graphics/media/MediaPlayer.h b/Source/platform/graphics/media/MediaPlayer.h
index a4d7ccdcac9f7590937e4603dd97d7403416489c..96f27bdf5273d52d9358e4e0a902f9d5b584af48 100644
--- a/Source/platform/graphics/media/MediaPlayer.h
+++ b/Source/platform/graphics/media/MediaPlayer.h
@@ -117,21 +117,11 @@ public:
 
     virtual bool supportsSave() const = 0;
 
-    virtual double duration() const = 0;
-
-    virtual double currentTime() const = 0;
-
-    virtual void seek(double) = 0;
-
-    virtual bool seeking() const = 0;
-
     virtual double rate() const = 0;
     virtual void setRate(double) = 0;
 
     virtual bool paused() const = 0;
 
-    virtual void setPoster(const KURL&) = 0;
-
     enum NetworkState { Empty, Idle, Loading, Loaded, FormatError, NetworkError, DecodeError };
     virtual NetworkState networkState() const = 0;