Fix up unused includes from chrome/browser/extensions to the rest of chrome/browser.

chrome/browser/extensions/active_tab_apitest.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 "base/logging.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/test/base/ui_test_utils.h"
 
 namespace extensions {
 namespace {
 
 // Times out on win asan, http://crbug.com/166026
 #if defined(OS_WIN) && defined(ADDRESS_SANITIZER)
 #define MAYBE_ActiveTab DISABLED_ActiveTab
 #else
@@ skipping 27 matching lines @@
   {
     ResultCatcher catcher;
     ui_test_utils::NavigateToURL(browser(),
                                  test_server()->GetURL("final_page.html"));
     EXPECT_TRUE(catcher.GetNextResult()) << message_;
   }
 }
 
 }  // namespace
 }  // namespace extensions