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

chrome/test/webdriver/webdriver_session.h

 // 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.
 
 #ifndef CHROME_TEST_WEBDRIVER_WEBDRIVER_SESSION_H_
 #define CHROME_TEST_WEBDRIVER_WEBDRIVER_SESSION_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 359 matching lines @@
   Error* ClearStorage(StorageType type);
 
   // Gets the keys of all items of the HTML5 localStorage object. If there are
   // no errors, the function sets |keys| and the caller takes ownership.
   Error* GetStorageKeys(StorageType type, base::ListValue** keys);
 
   // Gets the current geolocation.
   Error* GetGeolocation(scoped_ptr<base::DictionaryValue>* geolocation);
 
   // Overrides the current geolocation.
-  Error* OverrideGeolocation(base::DictionaryValue* geolocation);
+  Error* OverrideGeolocation(const base::DictionaryValue* geolocation);
 
   const std::string& id() const;
 
   const FrameId& current_target() const;
 
   void set_async_script_timeout(int timeout_ms);
   int async_script_timeout() const;
 
   void set_implicit_wait(int timeout_ms);
   int implicit_wait() const;
@@ skipping 103 matching lines @@
   // (e.g., 18.0.995.0 -> 995). Only valid after Chrome has started.
   // See http://dev.chromium.org/releases/version-numbers.
   int build_no_;
 
   DISALLOW_COPY_AND_ASSIGN(Session);
 };
 
 }  // namespace webdriver
 
 #endif  // CHROME_TEST_WEBDRIVER_WEBDRIVER_SESSION_H_