Update whitelists related to Cast for Media Router Component Extension.

chrome/common/extensions/api/_api_features.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This features file defines extension APIs implemented under src/chrome.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 //
 // Note that specifying "web_page", "blessed_web_page", or "all" as a context
 // type will require manually updating chrome/renderer/resources/dispatcher.cc.
@@ skipping 220 matching lines @@
   "desktopCapture": [{
     "dependencies": ["permission:desktopCapture"],
     "contexts": ["blessed_extension"]
   }, {
     "dependencies": ["permission:desktopCapturePrivate"],
     "whitelist": [
       "63ED55E43214C211F82122ED56407FF1A807F2A3",  // Dev
       "FA01E0B81978950F2BC5A50512FD769725F57510",  // Beta
       "B11A93E7E5B541F8010245EBDE2C74647D6C14B9",  // Canary
       "F155646B5D1CA545F7E1E4E20D573DFDD44C2540",  // Google Cast Beta
-      "16CA7A47AAE4BE49B1E75A6B960C3875E945B264"   // Google Cast Stable
+      "16CA7A47AAE4BE49B1E75A6B960C3875E945B264",  // Google Cast Stable
+      "C17CD9E6868D7B9C67926E0EC612EA25C768418F",  // http://crbug.com/457908
+      "EF2AB692559EA97C3BBDEA018A8C45F92457BD4E"   // http://crbug.com/457908
     ],
     "contexts": ["blessed_extension"]
   }],
   "developerPrivate": {
     "dependencies": ["permission:developerPrivate"],
     "contexts": ["blessed_extension"]
   },
   // All devtools APIs are implemented by hand, so don't compile them.
   "devtools.inspectedWindow": {
     "nocompile": true,
@@ skipping 444 matching lines @@
     "internal": true,
     "channel": "stable",
     "dependencies": ["permission:webview"],
     "contexts": ["blessed_extension"]
   },
   "windows": {
     "dependencies": ["api:tabs"],
     "contexts": ["blessed_extension"]
   }
 }