Add an automatic settings reset banner.

chrome/browser/prefs/tracked/tracked_split_preference.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_PREFS_TRACKED_TRACKED_SPLIT_PREFERENCE_H_
 #define CHROME_BROWSER_PREFS_TRACKED_TRACKED_SPLIT_PREFERENCE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 13 matching lines @@
   // Constructs a TrackedSplitPreference. |pref_path| must be a dictionary pref.
   TrackedSplitPreference(
       const std::string& pref_path,
       size_t reporting_id,
       size_t reporting_ids_count,
       PrefHashFilter::EnforcementLevel enforcement_level,
       PrefHashStore* pref_hash_store);
 
   // TrackedPreference implementation.
   virtual void OnNewValue(const base::Value* value) const OVERRIDE;
-  virtual void EnforceAndReport(
+  virtual bool EnforceAndReport(
       base::DictionaryValue* pref_store_contents) const OVERRIDE;
 
  private:
   const std::string pref_path_;
   const TrackedPreferenceHelper helper_;
   PrefHashStore* pref_hash_store_;
 
   DISALLOW_COPY_AND_ASSIGN(TrackedSplitPreference);
 };
 
 #endif  // CHROME_BROWSER_PREFS_TRACKED_TRACKED_SPLIT_PREFERENCE_H_