Split testing_pref_service.h/.cc into two parts, generic vs. Chrome-specific.

chrome/browser/web_resource/promo_resource_service_unittest.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 <vector>
 
 #include "base/json/json_reader.h"
 #include "base/message_loop.h"
 #include "base/prefs/pref_service.h"
 #include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/browser_prefs.h"
 #include "chrome/browser/web_resource/notification_promo.h"
 #include "chrome/browser/web_resource/promo_resource_service.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
+#include "chrome/test/base/scoped_testing_local_state.h"
 #include "chrome/test/base/testing_browser_process.h"
-#include "chrome/test/base/testing_pref_service.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/icu/public/i18n/unicode/smpdtfmt.h"
 
 namespace {
 
 const char kDateFormat[] = "dd MMM yyyy HH:mm:ss zzz";
 
@@ skipping 488 matching lines @@
   promo_test.TestInitFromPrefs();
 }
 
 TEST_F(PromoResourceServiceTest, PromoServerURLTest) {
   GURL promo_server_url = NotificationPromo::PromoServerURL();
   EXPECT_FALSE(promo_server_url.is_empty());
   EXPECT_TRUE(promo_server_url.is_valid());
   EXPECT_TRUE(promo_server_url.SchemeIs(chrome::kHttpsScheme));
   // TODO(achuith): Test this better.
 }