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

chrome/test/automation/automation_json_requests.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/test/automation/automation_json_requests.h"
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/format_macros.h"
 #include "base/json/json_reader.h"
@@ skipping 915 matching lines @@
   // TODO(kkania): Set correct auto_id instead of hardcoding windex.
   dict.SetInteger("windex", 0);
   dict.SetString("path", pref);
   dict.Set("value", value);
   DictionaryValue reply_dict;
   return SendAutomationJSONRequest(sender, dict, &reply_dict, error);
 }
 
 bool SendOverrideGeolocationJSONRequest(
     AutomationMessageSender* sender,
-    base::DictionaryValue* geolocation,
+    const base::DictionaryValue* geolocation,
     Error* error) {
   scoped_ptr<DictionaryValue> dict(geolocation->DeepCopy());
   dict->SetString("command", "OverrideGeoposition");
   DictionaryValue reply_dict;
   return SendAutomationJSONRequest(sender, *dict.get(), &reply_dict, error);
 }