Move preference MACs to the protected preference stores.

chrome/browser/prefs/pref_hash_store_transaction.h

Index: chrome/browser/prefs/pref_hash_store_transaction.h
diff --git a/chrome/browser/prefs/pref_hash_store_transaction.h b/chrome/browser/prefs/pref_hash_store_transaction.h
index f27e553a5adc44fb32a4ada2aa91d70b14fc7b12..bb6c9f768effd9bac41df00b18e9d53ee09c5b94 100644
--- a/chrome/browser/prefs/pref_hash_store_transaction.h
+++ b/chrome/browser/prefs/pref_hash_store_transaction.h
@@ -68,6 +68,10 @@ class PrefHashStoreTransaction {
       const std::string& path,
       const base::DictionaryValue* split_value) = 0;
 
+  virtual bool HasHash(const std::string& path) const = 0;
+  virtual void ImportHash(const std::string& path, const base::Value* hash) = 0;
+  virtual void ClearHash(const std::string& path) = 0;
+
   // Forces the super MAC to be updated. Returns true if this results in a
   // change to the store contents.
   virtual bool StampSuperMac() = 0;