Remove obsolete Cast extension IDs from various whitelists and files.

chrome/browser/media/webrtc/media_capture_devices_dispatcher.cc

Index: chrome/browser/media/webrtc/media_capture_devices_dispatcher.cc
diff --git a/chrome/browser/media/webrtc/media_capture_devices_dispatcher.cc b/chrome/browser/media/webrtc/media_capture_devices_dispatcher.cc
index b62fbc0de78230b03dce924dfa78045e9460ff2a..662dba9b5e016025174dc3fbfbb8bd22f5bcd26a 100644
--- a/chrome/browser/media/webrtc/media_capture_devices_dispatcher.cc
+++ b/chrome/browser/media/webrtc/media_capture_devices_dispatcher.cc
@@ -116,19 +116,9 @@ void MediaCaptureDevicesDispatcher::RegisterProfilePrefs(
 bool MediaCaptureDevicesDispatcher::IsOriginForCasting(const GURL& origin) {
   // Whitelisted tab casting extensions.
   return
-      // Dev
+      // Media Router Dev
       origin.spec() == "chrome-extension://enhhojjnijigcajfphajepfemndkmdlo/" ||
-      // Canary
-      origin.spec() == "chrome-extension://hfaagokkkhdbgiakmmlclaapfelnkoah/" ||
-      // Beta (internal)
-      origin.spec() == "chrome-extension://fmfcbgogabcbclcofgocippekhfcmgfj/" ||
-      // Google Cast Beta
-      origin.spec() == "chrome-extension://dliochdbjfkdbacpmhlcpmleaejidimm/" ||
-      // Google Cast Stable
-      origin.spec() == "chrome-extension://boadgeojelhgndaghljhdicfkmllpafd/" ||
-      // http://crbug.com/457908
-      origin.spec() == "chrome-extension://ekpaaapppgpmolpcldedioblbkmijaca/" ||
-      // http://crbug.com/574889
+      // Media Router Stable
       origin.spec() == "chrome-extension://pkedcjkdefgpdelpbcmbmeomcjbeemfm/";
 }