Restoring the chrome variatioons client, with a fix for browser_test failures caused by it.

chrome/test/base/testing_browser_process.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 "chrome/test/base/testing_browser_process.h"
 
 #include "base/string_util.h"
 #include "chrome/browser/notifications/notification_ui_manager.h"
 #include "chrome/browser/policy/browser_policy_connector.h"
 #include "chrome/browser/policy/policy_service_impl.h"
@@ skipping 44 matching lines @@
 }
 
 void TestingBrowserProcess::SetProfileManager(ProfileManager* profile_manager) {
   profile_manager_.reset(profile_manager);
 }
 
 PrefService* TestingBrowserProcess::local_state() {
   return local_state_;
 }
 
+VariationsService* TestingBrowserProcess::variations_service() {
+  return NULL;
+}
+
 policy::BrowserPolicyConnector*
     TestingBrowserProcess::browser_policy_connector() {
 #if defined(ENABLE_CONFIGURATION_POLICY)
   if (!browser_policy_connector_.get())
     browser_policy_connector_.reset(new policy::BrowserPolicyConnector());
 #endif
   return browser_policy_connector_.get();
 }
 
 policy::PolicyService* TestingBrowserProcess::policy_service() {
@@ skipping 180 matching lines @@
 
 void TestingBrowserProcess::SetBrowserPolicyConnector(
     policy::BrowserPolicyConnector* connector) {
   browser_policy_connector_.reset(connector);
 }
 
 void TestingBrowserProcess::SetSafeBrowsingService(
     SafeBrowsingService* sb_service) {
   sb_service_ = sb_service;
 }