Unpack theme data from extensions off of UI thread.

chrome/browser/infobars/infobars_browsertest.cc

 // 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.
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/crx_installer.h"
@@ skipping 58 matching lines @@
       browser(), embedded_test_server()->GetURL("/simple.html"),
       WindowOpenDisposition::NEW_FOREGROUND_TAB,
       ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
   content::WindowedNotificationObserver infobar_added_2(
         chrome::NOTIFICATION_TAB_CONTENTS_INFOBAR_ADDED,
         content::NotificationService::AllSources());
   content::WindowedNotificationObserver infobar_removed_1(
       chrome::NOTIFICATION_TAB_CONTENTS_INFOBAR_REMOVED,
         content::NotificationService::AllSources());
   InstallExtension("theme2.crx");
+  infobar_removed_1.Wait();
   infobar_added_2.Wait();
-  infobar_removed_1.Wait();
   EXPECT_EQ(
       0u,
       InfoBarService::FromWebContents(
           browser()->tab_strip_model()->GetWebContentsAt(0))->infobar_count());
 
   content::WindowedNotificationObserver infobar_removed_2(
       chrome::NOTIFICATION_TAB_CONTENTS_INFOBAR_REMOVED,
         content::NotificationService::AllSources());
   ThemeServiceFactory::GetForProfile(browser()->profile())->UseDefaultTheme();
   infobar_removed_2.Wait();
   EXPECT_EQ(0u,
             InfoBarService::FromWebContents(
                 browser()->tab_strip_model()->GetActiveWebContents())->
                 infobar_count());
 }