Remove unused WEBKIT_DEPRECATED thread

chrome/browser/extensions/extension_service_unittest.cc

 // Copyright (c) 2013 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/extensions/extension_service_unittest.h"
 
 #include <algorithm>
 #include <set>
 #include <vector>
 
@@ skipping 423 matching lines @@
 }
 
 // Our message loop may be used in tests which require it to be an IO loop.
 ExtensionServiceTestBase::ExtensionServiceTestBase()
     : loop_(base::MessageLoop::TYPE_IO),
       service_(NULL),
       management_policy_(NULL),
       expected_extensions_count_(0),
       ui_thread_(BrowserThread::UI, &loop_),
       db_thread_(BrowserThread::DB, &loop_),
-      webkit_thread_(BrowserThread::WEBKIT_DEPRECATED, &loop_),
       file_thread_(BrowserThread::FILE, &loop_),
       file_user_blocking_thread_(BrowserThread::FILE_USER_BLOCKING, &loop_),
       io_thread_(BrowserThread::IO, &loop_) {
   base::FilePath test_data_dir;
   if (!PathService::Get(chrome::DIR_TEST_DATA, &test_data_dir)) {
     ADD_FAILURE();
     return;
   }
   data_dir_ = test_data_dir.AppendASCII("extensions");
 }
@@ skipping 5817 matching lines @@
   provider->UpdateOrAddExtension(updates_from_webstore, "1", crx_path);
 
   service_->CheckForExternalUpdates();
   content::WindowedNotificationObserver(
       chrome::NOTIFICATION_CRX_INSTALLER_DONE,
       content::NotificationService::AllSources()).Wait();
   EXPECT_TRUE(extensions::HasExternalInstallError(service_));
   EXPECT_FALSE(extensions::HasExternalInstallBubble(service_));
   EXPECT_FALSE(service_->IsExtensionEnabled(updates_from_webstore));
 }