Mac: Fix fullscreen warning bubble only displaying intermittently.

Sometimes, a browser window isn't considered "on the current space"
during the fullscreen transition at the moment the exclusive access
bubble is displayed. Fix by checking again at the end of the transition.

Bug: 1000882
Change-Id: Ia2ef081098ca84f975dd26dfa6bf2615a3094af7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790378
Auto-Submit: Sidney San Martín <sdy@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694863}

components/remote_cocoa/app_shim/native_widget_ns_window_bridge.mm

@@ -853,6 +853,9 @@ void NativeWidgetNSWindowBridge::OnFullscreenTransitionComplete(
     bool actual_fullscreen_state) {
   in_fullscreen_transition_ = false;
 
+  // Add any children that were skipped during the fullscreen transition.
+  OrderChildren();
+
   if (has_deferred_window_close_) {
     [ns_window() close];
     return;