Correct const accessors in base/values.(h|cc), Part II (ListValue)

chrome/browser/sync/invalidations/invalidator_storage.cc

 // Copyright (c) 2012 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/sync/invalidations/invalidator_storage.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
@@ skipping 104 matching lines @@
   pref_service_->Set(prefs::kInvalidatorMaxInvalidationVersions,
                      max_versions_list);
 }
 
 // static
 void InvalidatorStorage::DeserializeFromList(
     const base::ListValue& max_versions_list,
     InvalidationVersionMap* max_versions_map) {
   max_versions_map->clear();
   for (size_t i = 0; i < max_versions_list.GetSize(); ++i) {
-    DictionaryValue* value = NULL;
+    const DictionaryValue* value = NULL;
     if (!max_versions_list.GetDictionary(i, &value)) {
       DLOG(WARNING) << "Unable to deserialize entry " << i;
       continue;
     }
     invalidation::ObjectId id;
     int64 max_version = 0;
     if (!ValueToObjectIdAndVersion(*value, &id, &max_version)) {
       DLOG(WARNING) << "Error while deserializing entry " << i;
       continue;
     }
@@ skipping 91 matching lines @@
                            utf8_state);
 }
 
 void InvalidatorStorage::Clear() {
   DCHECK(thread_checker_.CalledOnValidThread());
   pref_service_->ClearPref(prefs::kInvalidatorMaxInvalidationVersions);
   pref_service_->ClearPref(prefs::kInvalidatorInvalidationState);
 }
 
 }  // namespace browser_sync