Show no exit instruction on Mac when in Browser Fullscreen.

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index 586a829b3662c8574d219928a1ec3fc28a03ce43..48d819f992c16712e2e639ec40392a3298da74c2 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -1985,7 +1985,9 @@ willAnimateFromState:(bookmarks::VisualState)oldState
                            bubbleType:(FullscreenExitBubbleType)bubbleType {
   fullscreenUrl_ = url;
   fullscreenBubbleType_ = bubbleType;
-  if (bubbleType == FEB_TYPE_NONE) {
+  if (bubbleType == FEB_TYPE_NONE ||
+      bubbleType == FEB_TYPE_BROWSER_FULLSCREEN_EXIT_INSTRUCTION) {
+    // Show no exit instruction bubble on Mac when in Browser Fullscreen.
     [self destroyFullscreenExitBubbleIfNecessary];
   } else {
     if (!fullscreenExitBubbleController_.get()) {