Remove fullscreen toast in PresentationReceiverWindowView on Chrome OS

The text in the fullscreen exit toast is confusing on Chrome OS since it
is not commonly known how to access the F11 key.  It is not usually used
in BrowserView since immersive mode is used instead.  Additionally,
Chromebooks have a hardware fullscreen toggle button which should be
easily accessible for exiting fullscreen.

Bug: 825803
Change-Id: I855c9920e37e4176140c874e4a7c357cc6ab3e22
Reviewed-on: https://chromium-review.googlesource.com/988940Reviewed-by: Derek Cheng <imcheng@chromium.org>
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547632}

chrome/browser/ui/views/media_router/presentation_receiver_window_view.cc

@@ -318,7 +318,15 @@ void PresentationReceiverWindowView::UpdateExclusiveAccessExitBubbleContent(
     const GURL& url,
     ExclusiveAccessBubbleType bubble_type,
     ExclusiveAccessBubbleHideCallback bubble_first_hide_callback) {
+#if defined(CHROMEOS)
+  // On Chrome OS, we will not show the toast for the normal browser fullscreen
+  // mode.  The 'F11' text is confusing since how to access F11 on a Chromebook
+  // is not common knowledge and there is also a dedicated fullscreen toggle
+  // button available.
+  if (bubble_type == EXCLUSIVE_ACCESS_BUBBLE_TYPE_NONE || url.is_empty()) {
+#else
   if (bubble_type == EXCLUSIVE_ACCESS_BUBBLE_TYPE_NONE) {
+#endif
     // |exclusive_access_bubble_.reset()| will trigger callback for current
     // bubble with |ExclusiveAccessBubbleHideReason::kInterrupted| if available.
     exclusive_access_bubble_.reset();