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

chrome/browser/prefs/proxy_policy_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/memory/ref_counted.h"
 #include "chrome/browser/policy/mock_configuration_policy_provider.h"
 #include "chrome/browser/policy/policy_map.h"
 #include "chrome/browser/policy/policy_service_impl.h"
 #include "chrome/browser/prefs/browser_prefs.h"
@@ skipping 83 matching lines @@
     provider_.Shutdown();
   }
 
   PrefService* CreatePrefService(bool with_managed_policies) {
     PrefServiceMockBuilder builder;
     builder.WithCommandLine(&command_line_);
     if (with_managed_policies)
       builder.WithManagedPolicies(policy_service_.get());
     scoped_refptr<PrefRegistrySyncable> registry(new PrefRegistrySyncable);
     PrefServiceSyncable* prefs = builder.CreateSyncable(registry);
-    chrome::RegisterUserPrefs(prefs, registry);
+    chrome::RegisterUserPrefs(registry);
     return prefs;
   }
 
   CommandLine command_line_;
   MockConfigurationPolicyProvider provider_;
   scoped_ptr<PolicyServiceImpl> policy_service_;
 };
 
 TEST_F(ProxyPolicyTest, OverridesCommandLineOptions) {
   command_line_.AppendSwitchASCII(switches::kProxyBypassList, "123");
@@ skipping 97 matching lines @@
 
   // Try a second time time with the managed PrefStore in place, the
   // auto-detect should be overridden. The default pref store must be
   // in place with the appropriate default value for this to work.
   prefs.reset(CreatePrefService(true));
   ProxyConfigDictionary dict2(prefs->GetDictionary(prefs::kProxy));
   assertProxyModeWithoutParams(dict2, ProxyPrefs::MODE_DIRECT);
 }
 
 }  // namespace policy