Revert of Revert "Revert of Reland: Switch WindowedNotificationObserver to use base::RunLoop.

chrome/browser/ui/views/constrained_window_views_browsertest.cc

 // Copyright (c) 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 <memory>
 
 #include "base/macros.h"
 #include "base/test/scoped_feature_list.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 193 matching lines @@
   // Finch flag enabled.
   base::test::ScopedFeatureList scoped_feature_list;
   scoped_feature_list.InitAndEnableFeature(features::kBackspaceGoesBackFeature);
 
   EXPECT_TRUE(chrome::CanGoBack(browser()));
   EXPECT_TRUE(ui_test_utils::SendKeyPressSync(browser(), ui::VKEY_BACK,
                                               false, false, false, false));
   content::RunAllPendingInMessageLoop();
   content::WaitForLoadStop(web_contents);
 
-  // When Widget::Close is called, a task is posted that will destroy the
-  // widget. Here the widget is closed when the navigation commits. Load stop
-  // may occur right after the commit, before the widget is destroyed.
-  // Execute pending tasks to account for this.
-  base::RunLoop().RunUntilIdle();
-
   EXPECT_EQ(nullptr, dialog->GetWidget());
   EXPECT_EQ(original_url, web_contents->GetURL());
 }
 
 // Tests that the dialog closes when the escape key is pressed.
 IN_PROC_BROWSER_TEST_F(ConstrainedWindowViewTest, ClosesOnEscape) {
 #if defined(OS_WIN)
   // TODO(msw): The widget is not made NULL on XP. http://crbug.com/177482
   if (base::win::GetVersion() < base::win::VERSION_VISTA)
     return;
 #endif
 
   std::unique_ptr<TestDialog> dialog =
       ShowModalDialog(browser()->tab_strip_model()->GetActiveWebContents());
   EXPECT_TRUE(dialog->GetWidget()->IsVisible());
   EXPECT_TRUE(ui_test_utils::SendKeyPressSync(browser(), ui::VKEY_ESCAPE,
                                               false, false, false, false));
   content::RunAllPendingInMessageLoop();
   EXPECT_EQ(NULL, dialog->GetWidget());
 }