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

chrome/test/webdriver/commands/webelement_commands.h

 // Copyright (c) 2011 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_COMMANDS_WEBELEMENT_COMMANDS_H_
 #define CHROME_TEST_WEBDRIVER_COMMANDS_WEBELEMENT_COMMANDS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 11 matching lines @@
 namespace webdriver {
 
 class Error;
 class Response;
 
 // Handles commands that interact with a web element in the WebDriver REST
 // service.
 class WebElementCommand : public WebDriverCommand {
  public:
   WebElementCommand(const std::vector<std::string>& path_segments,
-                    const base::DictionaryValue* const parameters);
+                    base::DictionaryValue* const parameters);
   virtual ~WebElementCommand();
 
   virtual bool Init(Response* const response) OVERRIDE;
 
  protected:
   const std::vector<std::string>& path_segments_;
   ElementId element;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebElementCommand);
@@ skipping 234 matching lines @@
   virtual bool DoesGet() OVERRIDE;
   virtual void ExecuteGet(Response* const response) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ElementTextCommand);
 };
 
 }  // namespace webdriver
 
 #endif  // CHROME_TEST_WEBDRIVER_COMMANDS_WEBELEMENT_COMMANDS_H_