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 10022aae836311844aca1cd31ea2769453f5ab4d..9a31c15bb610d2f7b74f739935367db1027ec3f5 100644
--- a/chrome/browser/prefs/pref_hash_store_transaction.h
+++ b/chrome/browser/prefs/pref_hash_store_transaction.h
@@ -67,6 +67,28 @@ class PrefHashStoreTransaction {
   virtual void StoreSplitHash(
       const std::string& path,
       const base::DictionaryValue* split_value) = 0;
+
+  // Retrieves the stored hash for the preference at |path|. If there is no
+  // stored hash the result is NULL. If |path| is a split preference the result
+  // is a DictionaryValue whose keys are keys in the split preference and whose
+  // values are MACs of the corresponding values in the split preference.
+  // Otherwise the result is a StringValue containing a MAC of the preference
+  // value.
+  virtual const base::Value* GetHash(const std::string& path) const = 0;
+
+  // Sets the hash for the preference at |path|. |hash| may be a
+  // DictionaryValue or StringValue as returned by GetHash() or it may be NULL
+  // (which will clear any previously stored MAC).
+  // The (in)validity of the super MAC will be maintained by this call.
+  virtual void ImportHash(const std::string& path, const base::Value* hash) = 0;
+
+  // Removes the stored hash for the preference at |path|. The (in)validity of
+  // the super MAC will be maintained by this call.
+  virtual void ClearHash(const std::string& path) = 0;
+
+  // Forces the super MAC (if used by this store) to be updated. Returns true if
+  // this results in a change to the store contents.
+  virtual bool StampSuperMac() = 0;
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_HASH_STORE_TRANSACTION_H_