Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/profiles/off_the_record_profile_impl_unittest.cc

Index: chrome/browser/profiles/off_the_record_profile_impl_unittest.cc
diff --git a/chrome/browser/profiles/off_the_record_profile_impl_unittest.cc b/chrome/browser/profiles/off_the_record_profile_impl_unittest.cc
index b8572c57ddb74700beea107651abd375612e0173..13bc6828ed03c5388a71d7ad9ccf5960c1f8ef85 100644
--- a/chrome/browser/profiles/off_the_record_profile_impl_unittest.cc
+++ b/chrome/browser/profiles/off_the_record_profile_impl_unittest.cc
@@ -41,7 +41,7 @@ class TestingProfileWithHostZoomMap : public TestingProfile,
     return off_the_record_profile_.get();
   }
 
-  virtual PrefServiceSyncable* GetOffTheRecordPrefs() OVERRIDE {
+  virtual PrefService* GetOffTheRecordPrefs() OVERRIDE {
     return GetPrefs();
   }
 
@@ -87,7 +87,7 @@ class OffTheRecordProfileImplTest : public BrowserWithTestWindowTest {
 
   virtual void SetUp() OVERRIDE {
     prefs_.reset(new TestingPrefServiceSimple);
-    chrome::RegisterLocalState(prefs_->registry(), prefs_.get());
+    chrome::RegisterLocalState(prefs_.get(), prefs_->registry());
 
     browser_process()->SetLocalState(prefs_.get());