Don't use base::MessageLoop::{Quit,QuitClosure} in chrome/

chrome/browser/password_manager/native_backend_libsecret_unittest.cc

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdarg.h>
 
 #include "base/basictypes.h"
 #include "base/location.h"
 #include "base/prefs/pref_service.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 312 matching lines @@
     other_auth_.origin = GURL("http://www.example.com/");
     other_auth_.username_value = UTF8ToUTF16("username");
     other_auth_.password_value = UTF8ToUTF16("pass");
     other_auth_.signon_realm = "http://www.example.com/Realm";
     other_auth_.date_created = base::Time::Now();
     other_auth_.date_synced = base::Time::Now();
   }
 
   void TearDown() override {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::MessageLoop::QuitClosure());
+        FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
     base::MessageLoop::current()->Run();
     ASSERT_TRUE(global_mock_libsecret_items);
     global_mock_libsecret_items = nullptr;
   }
 
   void RunUIThread() { base::MessageLoop::current()->Run(); }
 
   void CheckUint32Attribute(const MockSecretItem* item,
                             const std::string& attribute,
                             uint32_t value) {
@@ skipping 561 matching lines @@
   EXPECT_EQ(form_google_, *form_list[0]);
 
   EXPECT_EQ(1u, global_mock_libsecret_items->size());
   if (!global_mock_libsecret_items->empty()) {
     CheckMockSecretItem((*global_mock_libsecret_items)[0], form_google_,
                         "chrome-42");
   }
 }
 
 // TODO(mdm): add more basic tests here at some point.