Added support for multiple parameters to Extension API callbacks.

chrome/browser/extensions/extension_chrome_auth_private_api.cc

Index: chrome/browser/extensions/extension_chrome_auth_private_api.cc
diff --git a/chrome/browser/extensions/extension_chrome_auth_private_api.cc b/chrome/browser/extensions/extension_chrome_auth_private_api.cc
index fcc4e2bd29886b327c802c4e52b58ccd379b078c..1a9ef31ca1eb8d9da9cf0ccf7fa2eab5a7bcc03d 100644
--- a/chrome/browser/extensions/extension_chrome_auth_private_api.cc
+++ b/chrome/browser/extensions/extension_chrome_auth_private_api.cc
@@ -34,7 +34,7 @@ bool SetCloudPrintCredentialsFunction::RunImpl() {
     std::string test_response = user_email;
     test_response.append(robot_email);
     test_response.append(credentials);
-    result_.reset(Value::CreateStringValue(test_response));
+    SetSingleResult(Value::CreateStringValue(test_response));
   } else {
     CloudPrintProxyServiceFactory::GetForProfile(profile_)->
         EnableForUserWithRobot(credentials, robot_email, user_email);