Add ability to change default pref values, and use in BrowserInstantController.

chrome/browser/policy/user_policy_signin_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 "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/prefs/pref_service.h"
 #include "base/run_loop.h"
 #include "chrome/browser/policy/browser_policy_connector.h"
 #include "chrome/browser/policy/cloud_policy_constants.h"
@@ skipping 81 matching lines @@
 
     local_state_.reset(new TestingPrefServiceSimple);
     chrome::RegisterLocalState(local_state_->registry());
     TestingBrowserProcess::GetGlobal()->SetLocalState(
         local_state_.get());
 
     // Create a testing profile with cloud-policy-on-signin enabled, and bring
     // up a UserCloudPolicyManager with a MockUserCloudPolicyStore.
     scoped_ptr<TestingPrefServiceSyncable> prefs(
         new TestingPrefServiceSyncable());
-    chrome::RegisterUserPrefs(prefs.get(), prefs->registry());
+    chrome::RegisterUserPrefs(prefs->registry());
     TestingProfile::Builder builder;
     builder.SetPrefService(scoped_ptr<PrefServiceSyncable>(prefs.Pass()));
     profile_ = builder.Build().Pass();
     profile_->CreateRequestContext();
 
     mock_store_ = new MockUserCloudPolicyStore();
     EXPECT_CALL(*mock_store_, Load()).Times(AnyNumber());
     manager_.reset(new UserCloudPolicyManager(
         profile_.get(), scoped_ptr<UserCloudPolicyStore>(mock_store_)));
     signin_manager_ = static_cast<FakeSigninManager*>(
@@ skipping 515 matching lines @@
   signin_manager_->ForceSignOut();
   ASSERT_FALSE(manager_->core()->service());
 
   // Now sign in again.
   TestSuccessfulSignin();
 }
 
 }  // namespace
 
 }  // namespace policy