Update the super MAC after performing MAC validation.

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 10022aae836311844aca1cd31ea2769453f5ab4d..f27e553a5adc44fb32a4ada2aa91d70b14fc7b12 100644
--- a/chrome/browser/prefs/pref_hash_store_transaction.h
+++ b/chrome/browser/prefs/pref_hash_store_transaction.h
@@ -67,6 +67,10 @@ class PrefHashStoreTransaction {
   virtual void StoreSplitHash(
       const std::string& path,
       const base::DictionaryValue* split_value) = 0;
+
+  // Forces the super MAC to be updated. Returns true if this results in a

[gab, 2014/06/11 21:28:04]

s/updated/set if it's invalid/

+  // change to the store contents.

[gab, 2014/06/11 21:28:04]

s/the store/this store's/

+  virtual bool StampSuperMac() = 0;

[gab, 2014/06/11 21:28:04]

How about SetSuperMacIfRequired() ?

With that name if it feels more natural to me that it may or may not do work and
that it would return a boolean based on whether it did work.

 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_HASH_STORE_TRANSACTION_H_