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

chrome/browser/policy/auto_enrollment_client_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 "chrome/browser/policy/auto_enrollment_client.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/prefs/pref_service.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/policy/mock_device_management_service.h"
 #include "chrome/common/pref_names.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 "crypto/sha2.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace em = enterprise_management;
 
 namespace policy {
 
@@ skipping 291 matching lines @@
   CreateClient(kSerial, 5, 10);
   ServerWillReply(-1, true, true);
   client_->Start();
   EXPECT_TRUE(client_->should_auto_enroll());
   EXPECT_EQ(1, completion_callback_count_);
 }
 
 }  // namespace
 
 }  // namespace policy