[Mac] Inform reference counted objects that hold a weak Browser* when the Browser is being destroye…

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h
index 2ad7e78e69f91f4115608b6555220f046d6daeb3..ffabce9d4d108462af9f69341d4f9ff0bec83bea 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h
@@ -300,6 +300,9 @@ willAnimateFromState:(BookmarkBar::State)oldState
              delegate:(id<BookmarkBarControllerDelegate>)delegate
        resizeDelegate:(id<ViewResizer>)resizeDelegate;
 
+// Called by BrowserWindowController when the Browser is being destroyed.
+- (void)browserWillBeDestroyed;
+
 // The Browser corresponding to this BookmarkBarController.
 - (Browser*)browser;