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

chrome/test/webdriver/commands/cookie_commands.h

Index: chrome/test/webdriver/commands/cookie_commands.h
diff --git a/chrome/test/webdriver/commands/cookie_commands.h b/chrome/test/webdriver/commands/cookie_commands.h
index 543c567de7aa8db2cc0b66c7bad5b28f795ef4a1..af1f3eb3232a3a025fec68886875d44344d1059b 100644
--- a/chrome/test/webdriver/commands/cookie_commands.h
+++ b/chrome/test/webdriver/commands/cookie_commands.h
@@ -26,7 +26,7 @@ class Response;
 class CookieCommand : public WebDriverCommand {
  public:
   CookieCommand(const std::vector<std::string>& path_segments,
-                const base::DictionaryValue* const parameters);
+                base::DictionaryValue* const parameters);
   virtual ~CookieCommand();
 
   virtual bool DoesDelete() OVERRIDE;
@@ -47,7 +47,7 @@ class CookieCommand : public WebDriverCommand {
 class NamedCookieCommand : public WebDriverCommand {
  public:
   NamedCookieCommand(const std::vector<std::string>& path_segments,
-                     const base::DictionaryValue* const parameters);
+                     base::DictionaryValue* const parameters);
   virtual ~NamedCookieCommand();
 
   virtual bool Init(Response* const response) OVERRIDE;