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

chrome/test/webdriver/commands/navigate_commands.cc

Index: chrome/test/webdriver/commands/navigate_commands.cc
diff --git a/chrome/test/webdriver/commands/navigate_commands.cc b/chrome/test/webdriver/commands/navigate_commands.cc
index ddb9b34e9031ff13fdf82a29814bfbb3f298fa4f..bc480f5ed176d40360eb8a9953d29ab5fcb3e436 100644
--- a/chrome/test/webdriver/commands/navigate_commands.cc
+++ b/chrome/test/webdriver/commands/navigate_commands.cc
@@ -11,7 +11,7 @@
 namespace webdriver {
 
 ForwardCommand::ForwardCommand(const std::vector<std::string>& path_segments,
-                 const DictionaryValue* const parameters)
+                 DictionaryValue* const parameters)
       : WebDriverCommand(path_segments, parameters) {}
 
 ForwardCommand::~ForwardCommand() {}
@@ -27,7 +27,7 @@ void ForwardCommand::ExecutePost(Response* const response) {
 }
 
 BackCommand::BackCommand(const std::vector<std::string>& path_segments,
-              const DictionaryValue* const parameters)
+              DictionaryValue* const parameters)
       : WebDriverCommand(path_segments, parameters) {}
 
 BackCommand::~BackCommand() {}
@@ -43,7 +43,7 @@ void BackCommand::ExecutePost(Response* const response) {
 }
 
 RefreshCommand::RefreshCommand(const std::vector<std::string>& path_segments,
-                               const DictionaryValue* const parameters)
+                               DictionaryValue* const parameters)
     : WebDriverCommand(path_segments, parameters) {}
 
 RefreshCommand::~RefreshCommand() {}