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

chrome/test/webdriver/commands/navigate_commands.h

Index: chrome/test/webdriver/commands/navigate_commands.h
diff --git a/chrome/test/webdriver/commands/navigate_commands.h b/chrome/test/webdriver/commands/navigate_commands.h
index 7a6a904bed1cdf5f4bccf5964c052ba18a1d0339..07a033bf19f06f557fb16fadff00a54a81f3e9c0 100644
--- a/chrome/test/webdriver/commands/navigate_commands.h
+++ b/chrome/test/webdriver/commands/navigate_commands.h
@@ -19,7 +19,7 @@ class Response;
 class ForwardCommand : public WebDriverCommand {
  public:
   ForwardCommand(const std::vector<std::string>& path_segments,
-                 const DictionaryValue* const parameters);
+                 DictionaryValue* const parameters);
   virtual ~ForwardCommand();
 
   virtual bool DoesPost() OVERRIDE;
@@ -34,7 +34,7 @@ class ForwardCommand : public WebDriverCommand {
 class BackCommand : public WebDriverCommand {
  public:
   BackCommand(const std::vector<std::string>& path_segments,
-              const DictionaryValue* const parameters);
+              DictionaryValue* const parameters);
   virtual ~BackCommand();
 
   virtual bool DoesPost() OVERRIDE;
@@ -49,7 +49,7 @@ class BackCommand : public WebDriverCommand {
 class RefreshCommand : public WebDriverCommand {
  public:
   RefreshCommand(const std::vector<std::string>& path_segments,
-                 const DictionaryValue* const parameters);
+                 DictionaryValue* const parameters);
   virtual ~RefreshCommand();
 
   virtual bool DoesPost() OVERRIDE;