Integrate registry_hash_store_contents with the rest of tracked prefs.

chrome/browser/prefs/profile_pref_store_manager.h

Index: chrome/browser/prefs/profile_pref_store_manager.h
diff --git a/chrome/browser/prefs/profile_pref_store_manager.h b/chrome/browser/prefs/profile_pref_store_manager.h
index 70af00b8b27be0c923c7871dcfec73b68acbc5e5..ae6122424cb56c6f754df17d02164e4739fbf8a7 100644
--- a/chrome/browser/prefs/profile_pref_store_manager.h
+++ b/chrome/browser/prefs/profile_pref_store_manager.h
@@ -99,6 +99,10 @@ class ProfilePrefStoreManager {
   // TrustedInitialized).
   std::unique_ptr<PrefHashStore> GetPrefHashStore(bool use_super_mac);
 
+  // On Windows, returns a PrefHashStore for the managed profile for use with
+  // |RegistryHashStoreContentsWin|. Returns nullptr otherwise.
+  std::unique_ptr<PrefHashStore> MaybeGetRegistryPrefHashStore();

[gab, 2016/08/03 18:19:34]

  // Returns a PrefHashStore that can be used for extra out-of-band
  // verifications on this platform (or null if none for this platform).
  std::unique_ptr<PrefHashStore> GetExternalVerificationPrefHashStore();

[proberge, 2016/08/04 00:13:45]

Done.

+
   const base::FilePath profile_path_;
   const std::vector<PrefHashFilter::TrackedPreferenceMetadata>
       tracking_configuration_;