Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/chromeos/proxy_config_service_impl_unittest.cc

Index: chrome/browser/chromeos/proxy_config_service_impl_unittest.cc
diff --git a/chrome/browser/chromeos/proxy_config_service_impl_unittest.cc b/chrome/browser/chromeos/proxy_config_service_impl_unittest.cc
index 9040c7719227234e6da9f8905b111cf118ca9365..5ad79f060e72d072886e2352e986e56d2477d3a0 100644
--- a/chrome/browser/chromeos/proxy_config_service_impl_unittest.cc
+++ b/chrome/browser/chromeos/proxy_config_service_impl_unittest.cc
@@ -235,7 +235,7 @@ class ProxyConfigServiceImplTestBase : public TESTBASE {
       : ui_thread_(BrowserThread::UI, &loop_),
         io_thread_(BrowserThread::IO, &loop_) {}
 
-  virtual void Init(PrefServiceSimple* pref_service) {
+  virtual void Init(PrefService* pref_service) {
     ASSERT_TRUE(pref_service);
     DBusThreadManager::Initialize();
     PrefProxyConfigTrackerImpl::RegisterPrefs(pref_service);