Ensure tests have an active task runner

chrome/browser/chromeos/login/auth/online_attempt_unittest.cc

Index: chrome/browser/chromeos/login/auth/online_attempt_unittest.cc
diff --git a/chrome/browser/chromeos/login/auth/online_attempt_unittest.cc b/chrome/browser/chromeos/login/auth/online_attempt_unittest.cc
index 8ba68a36f7d7176098c8aefb1fd39a8feffac8f8..668394049eba88d8de9f399b1efc946914306e4e 100644
--- a/chrome/browser/chromeos/login/auth/online_attempt_unittest.cc
+++ b/chrome/browser/chromeos/login/auth/online_attempt_unittest.cc
@@ -16,6 +16,7 @@
 #include "chromeos/login/auth/online_attempt.h"
 #include "chromeos/login/auth/test_attempt_state.h"
 #include "chromeos/login/auth/user_context.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "google_apis/gaia/gaia_auth_consumer.h"
 #include "google_apis/gaia/mock_url_fetcher_factory.h"
 #include "net/url_request/url_request_context.h"
@@ -84,9 +85,9 @@ class OnlineAttemptTest : public testing::Test {
                                        auth->weak_factory_.GetWeakPtr()));
   }
 
+  content::TestBrowserThreadBundle thread_bundle_;
   scoped_refptr<base::MessageLoopProxy> message_loop_;
   scoped_refptr<net::URLRequestContextGetter> request_context_;
-  base::MessageLoop loop_;
   TestAttemptState state_;
   MockAuthAttemptStateResolver resolver_;
   scoped_ptr<OnlineAttempt> attempt_;