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

chrome/browser/extensions/api/browsing_data/browsing_data_api.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.
 
 // Defines the Chrome Extensions BrowsingData API functions, which entail
 // clearing browsing data, and clearing the browser's cache (which, let's be
 // honest, are the same thing), as specified in the extension API JSON.
 
 #include "chrome/browser/extensions/api/browsing_data/browsing_data_api.h"
 
@@ skipping 174 matching lines @@
   remover->AddObserver(this);
   remover->Remove(removal_mask_, origin_set_mask_);
 }
 
 int BrowsingDataExtensionFunction::ParseOriginSetMask(
     const base::DictionaryValue& options) {
   // Parse the |options| dictionary to generate the origin set mask. Default to
   // UNPROTECTED_WEB if the developer doesn't specify anything.
   int mask = BrowsingDataHelper::UNPROTECTED_WEB;
 
-  DictionaryValue* d = NULL;
+  const DictionaryValue* d = NULL;
   if (options.HasKey(extension_browsing_data_api_constants::kOriginTypesKey)) {
     EXTENSION_FUNCTION_VALIDATE(options.GetDictionary(
         extension_browsing_data_api_constants::kOriginTypesKey, &d));
     bool value;
 
     // The developer specified something! Reset to 0 and parse the dictionary.
     mask = 0;
 
     // Unprotected web.
     if (d->HasKey(extension_browsing_data_api_constants::kUnprotectedWebKey)) {
@@ skipping 73 matching lines @@
   return BrowsingDataRemover::REMOVE_PLUGIN_DATA;
 }
 
 int RemovePasswordsFunction::GetRemovalMask() const {
   return BrowsingDataRemover::REMOVE_PASSWORDS;
 }
 
 int RemoveWebSQLFunction::GetRemovalMask() const {
   return BrowsingDataRemover::REMOVE_WEBSQL;
 }