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

chrome/browser/gpu_blacklist.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/gpu_blacklist.h"
 
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
@@ skipping 885 matching lines @@
 bool GpuBlacklist::LoadGpuBlacklist(
     const DictionaryValue& parsed_json, GpuBlacklist::OsFilter os_filter) {
   std::vector<ScopedGpuBlacklistEntry> entries;
 
   std::string version_string;
   parsed_json.GetString("version", &version_string);
   version_.reset(new Version(version_string));
   if (!version_->IsValid())
     return false;
 
-  ListValue* list = NULL;
+  const ListValue* list = NULL;
   if (!parsed_json.GetList("entries", &list))
     return false;
 
   uint32 max_entry_id = 0;
   bool contains_unknown_fields = false;
   for (size_t i = 0; i < list->GetSize(); ++i) {
     DictionaryValue* list_item = NULL;
     bool valid = list->GetDictionary(i, &list_item);
     if (!valid || list_item == NULL)
       return false;
@@ skipping 194 matching lines @@
   if (op == ">")
     return kGT;
   if (op == ">=")
     return kGE;
   if (op == "any")
     return kAny;
   if (op == "between")
     return kBetween;
   return kUnknown;
 }
-