Close cast dialog in VR

Cast dialog was enabled behind a flag in VR. It was a mistake since,
the same flag is used to enable some other popups. We should enable
cast icon once we VR can support this dilog.

Bug: 822090
Change-Id: I6c414f85d7b24a0f5dfaea4d37d541268abb4556
Reviewed-on: https://chromium-review.googlesource.com/1006037Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Amirhossein Simjour <asimjour@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549675}

chrome/browser/media/android/router/media_router_dialog_controller_android.cc

@@ -141,9 +141,7 @@ MediaRouterDialogControllerAndroid::~MediaRouterDialogControllerAndroid() {
 
 void MediaRouterDialogControllerAndroid::CreateMediaRouterDialog() {
   // TODO(crbug.com/736568): Re-enable dialog in VR.
-  if (vr::VrTabHelper::IsInVr(initiator()) &&
-      !base::FeatureList::IsEnabled(
-          chrome::android::kVrBrowsingNativeAndroidUi)) {
+  if (vr::VrTabHelper::IsInVr(initiator())) {
     CancelPresentationRequest();
     return;
   }