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

chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller.h

Index: chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller.h
diff --git a/chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller.h b/chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller.h
index 3b730fa05fd6cf87204a4222a630ec0922882009..7ec28db7650ce0ae59eaa89f2fde4b88fca08a17 100644
--- a/chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller.h
+++ b/chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller.h
@@ -77,6 +77,9 @@ class ZoomLevelObserver;
 // Designated initializer.
 - (id)initWithBrowser:(Browser*)browser;
 
+// Called by BrowserWindowController when the Browser is being destroyed.
+- (void)browserWillBeDestroyed;
+
 // Used to dispatch commands from the Wrench menu. The custom items within the
 // menu cannot be hooked up directly to First Responder because the window in
 // which the controls reside is not the BrowserWindowController, but a