Eliminate MediaPlayer abstraction(play/pause, other 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 48dbc12a594ed93e5166501562a1bfd2dcdab01d..ea5db1cb9cdb1e21acf6df2ab180f094db129cf6 100644
--- a/Source/platform/graphics/media/MediaPlayer.h
+++ b/Source/platform/graphics/media/MediaPlayer.h
@@ -112,11 +112,6 @@ public:
 
     virtual void load(blink::WebMediaPlayer::LoadType, const String& url, blink::WebMediaPlayer::CORSMode) = 0;
 
-    virtual void play() = 0;
-    virtual void pause() = 0;
-
-    virtual bool supportsSave() const = 0;
-
     virtual double duration() const = 0;
 
     virtual double currentTime() const = 0;
@@ -125,8 +120,6 @@ public:
 
     virtual bool seeking() const = 0;
 
-    virtual bool paused() const = 0;
-
     virtual void setPoster(const KURL&) = 0;
 
     enum NetworkState { Empty, Idle, Loading, Loaded, FormatError, NetworkError, DecodeError };
@@ -138,12 +131,6 @@ public:
     enum Preload { None, MetaData, Auto };
     virtual void setPreload(Preload) = 0;
 
-    virtual bool hasSingleSecurityOrigin() const = 0;
-
-    // Time value in the movie's time scale. It is only necessary to override this if the media
-    // engine uses rational numbers to represent media time.
-    virtual double mediaTimeForTimeValue(double timeValue) const = 0;
-
 #if ENABLE(WEB_AUDIO)
     virtual AudioSourceProvider* audioSourceProvider() = 0;
 #endif