Control interfaces exposed to the browser from the media service.

content/public/app/mojo/content_browser_manifest.json

Index: content/public/app/mojo/content_browser_manifest.json
diff --git a/content/public/app/mojo/content_browser_manifest.json b/content/public/app/mojo/content_browser_manifest.json
index 1d2d0fee84abb6789910f1bdce8ad6e771af6e3f..05e40d4f1ffd40f105b8be6e475081b4d1fdfb67 100644
--- a/content/public/app/mojo/content_browser_manifest.json
+++ b/content/public/app/mojo/content_browser_manifest.json
@@ -33,8 +33,6 @@
     "required": {
       "*": { "classes": [ "app" ] },
 
-      // We allow the browser to connect to any interfaces exposed by its child
-      // processes in the "browser" class.
       "exe:content_gpu": { "classes": [ "browser" ] },
       "exe:content_plugin": { "classes": [ "browser" ] },
       "exe:content_renderer": { "classes": [ "browser" ] },
@@ -53,7 +51,7 @@
           "user_service::UserService"
         ]
       },
-      "mojo:media": { "classes": [ "all_interfaces" ] }
+      "mojo:media": { "interfaces": [ "media::mojom::MediaService" ] }
     }
   }
 }