Create extensions_test_support build target

chrome/browser/ui/cocoa/extensions/media_galleries_dialog_cocoa_browsertest.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.
 
 #include "chrome/browser/ui/cocoa/extensions/media_galleries_dialog_cocoa.h"
 
 #include "chrome/browser/media_galleries/media_galleries_dialog_controller_mock.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/cocoa/constrained_window/constrained_window_alert.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
-#include "chrome/common/extensions/extension_test_util.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "content/public/test/test_utils.h"
 #include "extensions/common/extension.h"
+#include "extensions/common/test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::NiceMock;
 using ::testing::Return;
 using ::testing::ReturnRef;
 using web_modal::WebContentsModalDialogManager;
 
 class MediaGalleriesDialogBrowserTest : public InProcessBrowserTest {
 };
 
 // Verify that programatically closing the constrained window correctly closes
 // the sheet.
 IN_PROC_BROWSER_TEST_F(MediaGalleriesDialogBrowserTest, Close) {
   scoped_refptr<extensions::Extension> dummy_extension =
-      extension_test_util::CreateExtensionWithID("dummy");
+      extensions::test_util::CreateExtensionWithID("dummy");
   NiceMock<MediaGalleriesDialogControllerMock> controller(*dummy_extension);
 
   content::WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
   EXPECT_CALL(controller, web_contents()).
       WillRepeatedly(Return(web_contents));
 
   MediaGalleriesDialogController::GalleryPermissionsVector attached_permissions;
   EXPECT_CALL(controller, AttachedPermissions()).
       WillRepeatedly(Return(attached_permissions));
   MediaGalleriesDialogController::GalleryPermissionsVector
       unattached_permissions;
   EXPECT_CALL(controller, UnattachedPermissions()).
       WillRepeatedly(Return(unattached_permissions));
 
   scoped_ptr<MediaGalleriesDialogCocoa> dialog(
       static_cast<MediaGalleriesDialogCocoa*>(
           MediaGalleriesDialog::Create(&controller)));
   base::scoped_nsobject<NSWindow> window([[dialog->alert_ window] retain]);
   EXPECT_TRUE([window isVisible]);
 
   WebContentsModalDialogManager* web_contents_modal_dialog_manager =
       WebContentsModalDialogManager::FromWebContents(web_contents);
   WebContentsModalDialogManager::TestApi test_api(
       web_contents_modal_dialog_manager);
   test_api.CloseAllDialogs();
   EXPECT_FALSE([window isVisible]);
 }