Correct const accessors in base/values.(h|cc)

chrome/browser/ui/webui/print_preview/print_preview_handler.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/webui/print_preview/print_preview_handler.h"
 
 #include <ctype.h>
 
 #include <string>
 #include <vector>
@@ skipping 147 matching lines @@
   if (settings->empty()) {
     NOTREACHED() << "Print job settings dictionary is empty";
     return NULL;
   }
 
   return settings.release();
 }
 
 int GetPageCountFromSettingsDictionary(const DictionaryValue& settings) {
   int count = 0;
-  ListValue* page_range_array;
+  const ListValue* page_range_array;
   if (settings.GetList(printing::kSettingPageRange, &page_range_array)) {
     for (size_t index = 0; index < page_range_array->GetSize(); ++index) {
       DictionaryValue* dict;
       if (!page_range_array->GetDictionary(index, &dict))
         continue;
 
       printing::PageRange range;
       if (!dict->GetInteger(printing::kSettingPageRangeFrom, &range.from) ||
           !dict->GetInteger(printing::kSettingPageRangeTo, &range.to)) {
         continue;
@@ skipping 751 matching lines @@
     return;
 
   // We no longer require the initiator tab details. Remove those details
   // associated with the preview tab to allow the initiator tab to create
   // another preview tab.
   printing::PrintPreviewTabController* tab_controller =
       printing::PrintPreviewTabController::GetInstance();
   if (tab_controller)
     tab_controller->EraseInitiatorTabInfo(preview_tab_contents());
 }