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

chrome/test/webdriver/commands/html5_location_commands.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/webdriver/commands/html5_location_commands.h"
 
 #include "base/values.h"
 #include "chrome/test/webdriver/commands/response.h"
 #include "chrome/test/webdriver/webdriver_error.h"
 #include "chrome/test/webdriver/webdriver_session.h"
@@ skipping 19 matching lines @@
   scoped_ptr<base::DictionaryValue> geolocation;
   Error* error = session_->GetGeolocation(&geolocation);
   if (error) {
     response->SetError(error);
     return;
   }
   response->SetValue(geolocation.release());
 }
 
 void HTML5LocationCommand::ExecutePost(Response* const response) {
-  base::DictionaryValue* geolocation;
+  const base::DictionaryValue* geolocation;
   if (!GetDictionaryParameter("location", &geolocation)) {
     response->SetError(new Error(
         kBadRequest, "Missing or invalid 'location'"));
     return;
   }
   Error* error = session_->OverrideGeolocation(geolocation);
   if (error)
     response->SetError(error);
 }
 
 }  // namespace webdriver