Extension Commands changed by the user now take effect immediately.

chrome/browser/ui/views/browser_action_view.h

Index: chrome/browser/ui/views/browser_action_view.h
===================================================================
--- chrome/browser/ui/views/browser_action_view.h	(revision 144430)
+++ chrome/browser/ui/views/browser_action_view.h	(working copy)
@@ -98,6 +98,9 @@
  private:
   virtual ~BrowserActionButton();
 
+  void MaybeRegisterExtensionCommand();
+  void MaybeUnregisterExtensionCommand(bool only_if_active);
+
   // The browser action this view represents. The ExtensionAction is not owned
   // by this class.
   ExtensionAction* browser_action_;