Use ScopedTaskEnvironment instead of MessageLoop in components unit tests.

components/autofill/core/browser/autocomplete_history_manager_unittest.cc

 // Copyright 2013 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 <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "base/strings/string16.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/autofill/core/browser/autocomplete_history_manager.h"
 #include "components/autofill/core/browser/autofill_external_delegate.h"
 #include "components/autofill/core/browser/autofill_manager.h"
 #include "components/autofill/core/browser/autofill_test_utils.h"
 #include "components/autofill/core/browser/test_autofill_client.h"
 #include "components/autofill/core/browser/test_autofill_driver.h"
 #include "components/autofill/core/browser/webdata/autofill_webdata_service.h"
 #include "components/autofill/core/common/form_data.h"
 #include "components/prefs/pref_service.h"
@@ skipping 48 matching lines @@
   void SetUp() override {
     web_data_service_ = new MockWebDataService();
     autofill_client_.reset(new MockAutofillClient(web_data_service_));
     autofill_driver_.reset(new TestAutofillDriver());
     autocomplete_manager_.reset(new AutocompleteHistoryManager(
         autofill_driver_.get(), autofill_client_.get()));
   }
 
   void TearDown() override { autocomplete_manager_.reset(); }
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   scoped_refptr<MockWebDataService> web_data_service_;
   std::unique_ptr<AutocompleteHistoryManager> autocomplete_manager_;
   std::unique_ptr<AutofillDriver> autofill_driver_;
   std::unique_ptr<MockAutofillClient> autofill_client_;
 };
 
 // Tests that credit card numbers are not sent to the WebDatabase to be saved.
 TEST_F(AutocompleteHistoryManagerTest, CreditCardNumberValue) {
   FormData form;
   form.name = ASCIIToUTF16("MyForm");
@@ skipping 168 matching lines @@
               OnSuggestionsReturned(0,
                                     testing::Truly(IsEmptySuggestionVector)));
   autocomplete_history_manager.OnGetAutocompleteSuggestions(
       0,
       field.name,
       field.value,
       field.form_control_type);
 }
 
 }  // namespace autofill