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

chrome/test/webdriver/commands/command.h

Index: chrome/test/webdriver/commands/command.h
diff --git a/chrome/test/webdriver/commands/command.h b/chrome/test/webdriver/commands/command.h
index 97f0259e9fe1c0bb92021974ea437cae6e8448f6..ba95201d7693336992491de35415fa09b330c9cf 100644
--- a/chrome/test/webdriver/commands/command.h
+++ b/chrome/test/webdriver/commands/command.h
@@ -95,11 +95,11 @@ class Command {
   // 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_;