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

chrome/browser/ui/tabs/pinned_tab_codec.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/ui/tabs/pinned_tab_codec.h"
 
 #include "base/values.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
@@ skipping 134 matching lines @@
 
 // static
 StartupTabs PinnedTabCodec::ReadPinnedTabs(const base::Value* value) {
   StartupTabs results;
 
   const base::ListValue* tabs_list = NULL;
   if (!value->GetAsList(&tabs_list))
     return results;
 
   for (size_t i = 0, max = tabs_list->GetSize(); i < max; ++i) {
-    base::DictionaryValue* tab_values = NULL;
+    const base::DictionaryValue* tab_values = NULL;
     if (tabs_list->GetDictionary(i, &tab_values)) {
       StartupTab tab;
       if (DecodeTab(*tab_values, &tab))
         results.push_back(tab);
     }
   }
   return results;
 }