[Extensions Toolbar] Properly render newly-added extensions

chrome/browser/ui/cocoa/extensions/extension_installed_bubble_controller.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/extensions/extension_installed_bubble_controller.h"
 
 #include "base/i18n/rtl.h"
 #include "base/mac/bundle_locations.h"
 #include "base/mac/mac_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 160 matching lines @@
   return extensions::sync_helper::IsSyncableExtension(extension_) &&
          SyncPromoUI::ShouldShowSyncPromo(browser_->profile());
 }
 
 - (void)windowWillClose:(NSNotification*)notification {
   // Turn off page action icon preview when the window closes, unless we
   // already removed it when the window resigned key status.
   [self removePageActionPreviewIfNecessary];
   extension_ = NULL;
   browser_ = NULL;
-
+  [closeButton_ setTrackingEnabled:NO];
   [super windowWillClose:notification];
 }
 
 // The controller is the delegate of the window, so it receives "did resign
 // key" notifications.  When key is resigned, close the window.
 - (void)windowDidResignKey:(NSNotification*)notification {
   // If the browser window is closing, we need to remove the page action
   // immediately, otherwise the closing animation may overlap with
   // browser destruction.
   [self removePageActionPreviewIfNecessary];
@@ skipping 508 matching lines @@
   install_ui->OpenAppInstalledUI(extension_->id());
 }
 
 - (void)awakeFromNib {
   if (bundle_)
     return;
   [self initializeLabel];
 }
 
 @end