Allow some Android media player implementation to be overridden by embedders.

media/base/android/media_player_android.cc

Index: media/base/android/media_player_android.cc
diff --git a/media/base/android/media_player_android.cc b/media/base/android/media_player_android.cc
index 90d4fa9dfcbc9cb34c27bda86696f4b7182e7386..1b2b3692cb1b53e30ce3f5923ca27f1a48ca1e3a 100644
--- a/media/base/android/media_player_android.cc
+++ b/media/base/android/media_player_android.cc
@@ -76,4 +76,12 @@ void MediaPlayerAndroid::OnSeekRequestAck() {
   NOTREACHED() << "Unexpected ipc received";
 }
 
+GURL MediaPlayerAndroid::GetUrl() {
+  return GURL();
+}
+
+GURL MediaPlayerAndroid::GetFirstPartyForCookies() {
+  return GURL();
+}
+
 }  // namespace media