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

chrome/test/webdriver/commands/command.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_COMMAND_H_
 #define CHROME_TEST_WEBDRIVER_COMMANDS_COMMAND_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 77 matching lines @@
   // false if there is no such parameter, or if it is not a int.
   bool GetIntegerParameter(const std::string& key, int* out) const;
 
   // Provides the command parameter with the given |key| as a double. Returns
   // false if there is no such parameter, or if it is not a dobule.
   bool GetDoubleParameter(const std::string& key, double* out) const;
 
   // Provides the command parameter with the given |key| as a Dictionary.
   // Returns false if there is no such parameter, or if it is not a Dictionary.
   bool GetDictionaryParameter(const std::string& key,
-                              DictionaryValue** out) const;
+                              const DictionaryValue** out) const;
 
   // Provides the command parameter with the given |key| as a list. Returns
   // false if there is no such parameter, or if it is not a list.
-  bool GetListParameter(const std::string& key, ListValue** out) const;
+  bool GetListParameter(const std::string& key, const ListValue** out) const;
 
   const std::vector<std::string> path_segments_;
   const scoped_ptr<const DictionaryValue> parameters_;
 
  private:
 #if defined(OS_MACOSX)
   // An autorelease pool must exist on any thread where Objective C is used,
   // even implicitly. Otherwise the warning:
   //   "Objects autoreleased with no pool in place."
   // is printed for every object deallocated.  Since every incoming command to
   // chrome driver is allocated a new thread, the release pool is declared here.
   base::mac::ScopedNSAutoreleasePool autorelease_pool;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(Command);
 };
 
 }  // namespace webdriver
 
 #endif  // CHROME_TEST_WEBDRIVER_COMMANDS_COMMAND_H_