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..0e0e20d94c73802b100bd04a90f2427c66e3e159 100644
--- a/chrome/browser/prefs/pref_hash_store_transaction.h
+++ b/chrome/browser/prefs/pref_hash_store_transaction.h
@@ -51,6 +51,11 @@ class PrefHashStoreTransaction {
   virtual void StoreHash(const std::string& path,
                          const base::Value* value) = 0;
 
+  virtual const base::Value* GetHash(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;
+  virtual bool StampSuperMac() = 0;

[gab, 2014/06/06 21:54:59]

Add those methods at the bottom of this file (keeping CheckValue/StoreHash and
CheckSplitValue/StoreSplitHash together makes more sense than adding this in
between).

And add comments for them.

[erikwright (departed), 2014/06/10 20:27:47]

Done.

+
   // Checks |initial_value| against the existing stored hashes for the split
   // preference at |path|. |initial_split_value| being an empty dictionary or
   // NULL is equivalent. |invalid_keys| must initially be empty. |invalid_keys|