Add an automatic settings reset banner.

chrome/browser/prefs/tracked/tracked_split_preference.cc

 // 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.
 
 #include "chrome/browser/prefs/tracked/tracked_split_preference.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/values.h"
@@ skipping 12 matching lines @@
     const base::Value* value,
     PrefHashStoreTransaction* transaction) const {
   const base::DictionaryValue* dict_value = NULL;
   if (value && !value->GetAsDictionary(&dict_value)) {
     NOTREACHED();
     return;
   }
   transaction->StoreSplitHash(pref_path_, dict_value);
 }
 
-void TrackedSplitPreference::EnforceAndReport(
+bool TrackedSplitPreference::EnforceAndReport(
     base::DictionaryValue* pref_store_contents,
     PrefHashStoreTransaction* transaction) const {
   base::DictionaryValue* dict_value = NULL;
   if (!pref_store_contents->GetDictionary(pref_path_, &dict_value) &&
       pref_store_contents->Get(pref_path_, NULL)) {
     // There should be a dictionary or nothing at |pref_path_|.
     NOTREACHED();
-    return;
+    return false;
   }
 
   std::vector<std::string> invalid_keys;
   PrefHashStoreTransaction::ValueState value_state =
       transaction->CheckSplitValue(pref_path_, dict_value, &invalid_keys);
 
   if (value_state == PrefHashStoreTransaction::CHANGED)
     helper_.ReportSplitPreferenceChangedCount(invalid_keys.size());
 
   helper_.ReportValidationResult(value_state);
 
   TrackedPreferenceHelper::ResetAction reset_action =
       helper_.GetAction(value_state);
   helper_.ReportAction(reset_action);
 
+  bool was_reset = false;
   if (reset_action == TrackedPreferenceHelper::DO_RESET) {
     if (value_state == PrefHashStoreTransaction::CHANGED) {
       DCHECK(!invalid_keys.empty());
 
       for (std::vector<std::string>::const_iterator it =
                invalid_keys.begin(); it != invalid_keys.end(); ++it) {
         dict_value->Remove(*it, NULL);
       }
     } else {
       pref_store_contents->RemovePath(pref_path_, NULL);
     }
+    was_reset = true;
   }
 
   if (value_state != PrefHashStoreTransaction::UNCHANGED) {
     // Store the hash for the new value (whether it was reset or not).
     const base::DictionaryValue* new_dict_value = NULL;
     pref_store_contents->GetDictionary(pref_path_, &new_dict_value);
     transaction->StoreSplitHash(pref_path_, new_dict_value);
   }
+
+  return was_reset;
 }