Add Promises for EME (Chromium side)

media/base/android/media_player_manager.h

Index: media/base/android/media_player_manager.h
diff --git a/media/base/android/media_player_manager.h b/media/base/android/media_player_manager.h
index c7c996aa67b1e88efa80eaf9093e73053903b52a..e82ac1afb3d3f4776e7a1c96182cfb6bbe304bc9 100644
--- a/media/base/android/media_player_manager.h
+++ b/media/base/android/media_player_manager.h
@@ -19,7 +19,7 @@ class GURL;
 
 namespace media {
 
-class MediaKeys;
+class MediaDrmBridge;
 class MediaPlayerAndroid;
 class MediaResourceGetter;
 
@@ -75,7 +75,7 @@ class MEDIA_EXPORT MediaPlayerManager {
   virtual void DestroyAllMediaPlayers() = 0;
 
   // Get the CDM for the given CDM ID.
-  virtual MediaKeys* GetCdm(int cdm_id) = 0;
+  virtual MediaDrmBridge* GetCdm(int cdm_id) = 0;
 
   // Called by the player to get a hardware protected surface.
   virtual void RequestFullScreen(int player_id) = 0;