Use ScopedTaskEnvironment instead of MessageLoop in components unit tests.

components/google/core/browser/google_url_tracker_unittest.cc

 // Copyright 2012 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 "components/google/core/browser/google_url_tracker.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
 #include "base/macros.h"
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/google/core/browser/google_pref_names.h"
 #include "components/google/core/browser/google_url_tracker_client.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/testing_pref_service.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request_test_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 102 matching lines @@
   void FinishSleep();
   void NotifyNetworkChanged();
   void set_google_url(const GURL& url) {
     google_url_tracker_->google_url_ = url;
   }
   GURL google_url() const { return google_url_tracker_->google_url(); }
   bool listener_notified() const { return listener_.notified(); }
   void clear_listener_notified() { listener_.clear_notified(); }
 
  private:
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   TestingPrefServiceSimple prefs_;
 
   // Creating this allows us to call
   // net::NetworkChangeNotifier::NotifyObserversOfNetworkChangeForTests().
   std::unique_ptr<net::NetworkChangeNotifier> network_change_notifier_;
   net::TestURLFetcherFactory fetcher_factory_;
   GoogleURLTrackerClient* client_;
   std::unique_ptr<GoogleURLTracker> google_url_tracker_;
   TestCallbackListener listener_;
 };
@@ skipping 200 matching lines @@
   EXPECT_TRUE(listener_notified());
   clear_listener_notified();
 
   RequestServerCheck();
   // The second request should be ignored.
   EXPECT_FALSE(GetFetcher());
   MockSearchDomainCheckResponse(".google.co.in");
   EXPECT_EQ(GURL("https://www.google.co.uk/"), google_url());
   EXPECT_FALSE(listener_notified());
 }