Remove obsolete Cast extension IDs from various whitelists and files.

extensions/browser/guest_view/extension_view/whitelist/extension_view_whitelist.cc

Index: extensions/browser/guest_view/extension_view/whitelist/extension_view_whitelist.cc
diff --git a/extensions/browser/guest_view/extension_view/whitelist/extension_view_whitelist.cc b/extensions/browser/guest_view/extension_view/whitelist/extension_view_whitelist.cc
index a08cf536f78a0faac2e53075a2bde4f59b7fa57f..887fe0a0e797c67fedebaa96db476b29a8e529c0 100644
--- a/extensions/browser/guest_view/extension_view/whitelist/extension_view_whitelist.cc
+++ b/extensions/browser/guest_view/extension_view/whitelist/extension_view_whitelist.cc
@@ -22,11 +22,8 @@ namespace {
 const char* const kWhitelist[] = {
     "pemeknaakobkocgmimdeamlcklioagkh",  // Used in browser tests
     "dppcjffonoklmpdmljnpdojmoaefcabf",  // Used in browser tests
-    "pkedcjkdefgpdelpbcmbmeomcjbeemfm",  // http://crbug.com/574889
-    "ekpaaapppgpmolpcldedioblbkmijaca",  // http://crbug.com/552208
-    "lhkfccafpkdlaodkicmokbmfapjadkij",  // http://crbug.com/552208
-    "ibiljbkambkbohapfhoonkcpcikdglop",  // http://crbug.com/552208
-    "enhhojjnijigcajfphajepfemndkmdlo",  // http://crbug.com/552208
+    "enhhojjnijigcajfphajepfemndkmdlo",  // Media Router Dev
+    "pkedcjkdefgpdelpbcmbmeomcjbeemfm",  // Media Router Stable
 };
 
 }  // namespace