Revert of Introduce WebMediaSession

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 2075311a934747fa3014783f217ae1f5710d140e..ef6836878cde2d22259a94bbac3604c0d3f8b66b 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -175,7 +175,6 @@
 #include "content/renderer/media/android/renderer_media_player_manager.h"
 #include "content/renderer/media/android/stream_texture_factory_impl.h"
 #include "content/renderer/media/android/webmediaplayer_android.h"
-#include "content/renderer/media/android/webmediasession_android.h"
 #else
 #include "cc/blink/context_provider_web_context.h"
 #include "content/renderer/usb/web_usb_client_impl.h"
@@ -220,7 +219,6 @@
 using blink::WebMediaPlayer;
 using blink::WebMediaPlayerClient;
 using blink::WebMediaPlayerEncryptedMediaClient;
-using blink::WebMediaSession;
 using blink::WebNavigationPolicy;
 using blink::WebNavigationType;
 using blink::WebNode;
@@ -2132,14 +2130,6 @@
 #endif  // defined(OS_ANDROID) && !defined(ENABLE_MEDIA_PIPELINE_ON_ANDROID)
 }
 
-blink::WebMediaSession* RenderFrameImpl::createMediaSession() {
-#if defined(OS_ANDROID)
-  return new WebMediaSessionAndroid();
-#else
-  return nullptr;
-#endif  // defined(OS_ANDROID)
-}
-
 blink::WebApplicationCacheHost* RenderFrameImpl::createApplicationCacheHost(
     blink::WebLocalFrame* frame,
     blink::WebApplicationCacheHostClient* client) {