Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/policy/device_cloud_policy_manager_chromeos_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/device_cloud_policy_manager_chromeos.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
@@ skipping 29 matching lines @@
  protected:
   DeviceCloudPolicyManagerChromeOSTest()
       : cryptohome_library_(chromeos::CryptohomeLibrary::GetImpl(true)),
         install_attributes_(cryptohome_library_.get()),
         store_(new DeviceCloudPolicyStoreChromeOS(&device_settings_service_,
                                                   &install_attributes_)),
         manager_(make_scoped_ptr(store_), &install_attributes_) {}
 
   virtual void SetUp() OVERRIDE {
     DeviceSettingsTestBase::SetUp();
-    chrome::RegisterLocalState(local_state_.registry(), &local_state_);
+    chrome::RegisterLocalState(&local_state_, local_state_.registry());
     manager_.Init();
   }
 
   virtual void TearDown() OVERRIDE {
     manager_.Shutdown();
     DeviceSettingsTestBase::TearDown();
   }
 
   scoped_ptr<chromeos::CryptohomeLibrary> cryptohome_library_;
   EnterpriseInstallAttributes install_attributes_;
@@ skipping 278 matching lines @@
 TEST_F(DeviceCloudPolicyManagerChromeOSEnrollmentTest, LoadError) {
   loaded_blob_.clear();
   RunTest();
   ExpectFailedEnrollment(EnrollmentStatus::STATUS_STORE_ERROR);
   EXPECT_EQ(CloudPolicyStore::STATUS_LOAD_ERROR,
             status_.store_status());
 }
 
 }  // namespace
 }  // namespace policy