Integrate registry_hash_store_contents with the rest of tracked prefs.

components/user_prefs/tracked/tracked_preference_histogram_names.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/user_prefs/tracked/tracked_preference_histogram_names.h"
 
 namespace user_prefs {
 namespace tracked {
 
 // Tracked pref histogram names.
 const char kTrackedPrefHistogramUnchanged[] =
     "Settings.TrackedPreferenceUnchanged";
 const char kTrackedPrefHistogramCleared[] = "Settings.TrackedPreferenceCleared";
 const char kTrackedPrefHistogramMigratedLegacyDeviceId[] =
     "Settings.TrackedPreferenceMigratedLegacyDeviceId";
 const char kTrackedPrefHistogramChanged[] = "Settings.TrackedPreferenceChanged";
 const char kTrackedPrefHistogramInitialized[] =
     "Settings.TrackedPreferenceInitialized";
 const char kTrackedPrefHistogramTrustedInitialized[] =
     "Settings.TrackedPreferenceTrustedInitialized";
 const char kTrackedPrefHistogramNullInitialized[] =
     "Settings.TrackedPreferenceNullInitialized";
 const char kTrackedPrefHistogramWantedReset[] =
     "Settings.TrackedPreferenceWantedReset";
 const char kTrackedPrefHistogramReset[] = "Settings.TrackedPreferenceReset";
 const char kTrackedSplitPrefHistogramChanged[] =
     "Settings.TrackedSplitPreferenceChanged.";
+const char kTrackedPrefRegistryValidationSuffix[] = "FromRegistry";
 
 }  // namespace tracked
 }  // namespace user_prefs