[Mac] Don't close the Wrench menu after using the zoom buttons if the menu was opened sticky.

chrome/browser/cocoa/wrench_menu_controller.h

Index: chrome/browser/cocoa/wrench_menu_controller.h
diff --git a/chrome/browser/cocoa/wrench_menu_controller.h b/chrome/browser/cocoa/wrench_menu_controller.h
index ba5051ce2c75b09e305dbfd382c0340fc61c4c0e..99f37438333361fdca5aa583f2d0e747ac94799e 100644
--- a/chrome/browser/cocoa/wrench_menu_controller.h
+++ b/chrome/browser/cocoa/wrench_menu_controller.h
@@ -9,12 +9,17 @@
 #import <Cocoa/Cocoa.h>
 
 #import "base/cocoa_protocols_mac.h"
+#include "base/scoped_ptr.h"
 #import "chrome/browser/cocoa/menu_controller.h"
 
 @class MenuTrackedRootView;
 @class ToolbarController;
 class WrenchMenuModel;
 
+namespace WrenchMenuControllerInternal {
+class ZoomLevelObserver;
+}  // namespace WrenchMenuControllerInternal
+
 // The Wrench menu has a creative layout, with buttons in menu items. There is
 // a cross-platform model for this special menu, but on the Mac it's easier to
 // get spacing and alignment precisely right using a NIB. To do that, we
@@ -34,6 +39,8 @@ class WrenchMenuModel;
   IBOutlet NSButton* zoomDisplay_;
   IBOutlet NSButton* zoomMinus_;
   IBOutlet NSButton* zoomFullScreen_;
+
+  scoped_ptr<WrenchMenuControllerInternal::ZoomLevelObserver> observer_;
 }
 
 // Designated initializer; called within the NIB.