Update the super MAC after performing MAC validation.

chrome/browser/prefs/pref_hash_store_impl.cc

Index: chrome/browser/prefs/pref_hash_store_impl.cc
diff --git a/chrome/browser/prefs/pref_hash_store_impl.cc b/chrome/browser/prefs/pref_hash_store_impl.cc
index a82d449f4e40ff4618ca6c998a3c563ffafd56d5..3702bb814c2c9269bf9a50eebf33f5ccb7f11250 100644
--- a/chrome/browser/prefs/pref_hash_store_impl.cc
+++ b/chrome/browser/prefs/pref_hash_store_impl.cc
@@ -40,6 +40,7 @@ class PrefHashStoreImpl::PrefHashStoreTransactionImpl
                                 const base::Value* value) const OVERRIDE;
   virtual void StoreHash(const std::string& path,
                          const base::Value* value) OVERRIDE;
+  virtual bool StampSuperMac() OVERRIDE;
   virtual ValueState CheckSplitValue(
       const std::string& path,
       const base::DictionaryValue* initial_split_value,
@@ -148,6 +149,13 @@ void PrefHashStoreImpl::PrefHashStoreTransactionImpl::StoreHash(
   has_changed_ = true;
 }
 
+bool PrefHashStoreImpl::PrefHashStoreTransactionImpl::StampSuperMac() {
+  if (outer_->initial_hashes_dictionary_trusted_)
+    return false;
+  has_changed_ = true;
+  return true;
+}
+
 PrefHashStoreTransaction::ValueState
 PrefHashStoreImpl::PrefHashStoreTransactionImpl::CheckSplitValue(
     const std::string& path,