media: Remove Browser CDM implementation

content/browser/media/android/media_web_contents_observer_android.h

Index: content/browser/media/android/media_web_contents_observer_android.h
diff --git a/content/browser/media/android/media_web_contents_observer_android.h b/content/browser/media/android/media_web_contents_observer_android.h
index f546aaeabea88e77bd58c3983bed40e68ab29a56..f000a2c322faaf6a9a82c6e7acf5c749631f8795 100644
--- a/content/browser/media/android/media_web_contents_observer_android.h
+++ b/content/browser/media/android/media_web_contents_observer_android.h
@@ -20,7 +20,6 @@ enum class MediaContentType;
 
 namespace content {
 
-class BrowserCdmManager;
 class BrowserMediaPlayerManager;
 class BrowserMediaSessionManager;
 class BrowserSurfaceViewManager;
@@ -82,17 +81,12 @@ class CONTENT_EXPORT MediaWebContentsObserverAndroid
   bool OnMediaPlayerMessageReceived(const IPC::Message& message,
                                     RenderFrameHost* render_frame_host);
 
-  bool OnMediaPlayerSetCdmMessageReceived(const IPC::Message& message,
-                                          RenderFrameHost* render_frame_host);
-
   bool OnMediaSessionMessageReceived(const IPC::Message& message,
                                      RenderFrameHost* render_frame_host);
 
   bool OnSurfaceViewManagerMessageReceived(const IPC::Message& message,
                                      RenderFrameHost* render_frame_host);
 
-  void OnSetCdm(RenderFrameHost* render_frame_host, int player_id, int cdm_id);
-
   // Map from RenderFrameHost* to BrowserMediaPlayerManager.
   using MediaPlayerManagerMap =
       base::ScopedPtrHashMap<RenderFrameHost*,