Move preference MACs to the protected preference stores.

base/prefs/json_pref_store.h

Index: base/prefs/json_pref_store.h
diff --git a/base/prefs/json_pref_store.h b/base/prefs/json_pref_store.h
index 49e74ee23a5c5273999354634c2d99b2a1c7ae8b..4f7b3c88585f29340925d25b7023c2a054a9e502 100644
--- a/base/prefs/json_pref_store.h
+++ b/base/prefs/json_pref_store.h
@@ -109,10 +109,9 @@ class BASE_PREFS_EXPORT JsonPrefStore
   // |initialization_successful| is pre-determined by OnFileRead() and should
   // be used when reporting OnInitializationCompleted().
   // |schedule_write| indicates whether a write should be immediately scheduled
-  // (typically because the |pref_filter_| has already altered the |prefs|) --
+  // (typically because the |pref_filter_| has already altered the prefs) --
   // this will be ignored if this store is read-only.
   void FinalizeFileRead(bool initialization_successful,
-                        scoped_ptr<base::DictionaryValue> prefs,
                         bool schedule_write);
 
   base::FilePath path_;