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

chrome/browser/printing/print_preview_dialog_controller_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 "chrome/browser/printing/print_preview_dialog_controller.h"
 
 #include <memory>
 
 #include "base/bind_helpers.h"
 #include "base/files/file_path.h"
@@ skipping 248 matching lines @@
   // Check a new print preview dialog got created.
   ASSERT_TRUE(preview_dialog);
   ASSERT_NE(initiator(), preview_dialog);
 
   // Reload the initiator. Make sure reloading destroys the print preview
   // dialog.
   PrintPreviewDialogDestroyedObserver dialog_destroyed_observer(preview_dialog);
   chrome::Reload(browser(), WindowOpenDisposition::CURRENT_TAB);
   content::WaitForLoadStop(
       browser()->tab_strip_model()->GetActiveWebContents());
-  // 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();
   ASSERT_TRUE(dialog_destroyed_observer.dialog_destroyed());
 
   // Try printing again.
   PrintPreview();
 
   // Create a preview dialog for the initiator tab.
   WebContents* new_preview_dialog = GetPrintPreviewDialog();
   EXPECT_TRUE(new_preview_dialog);
 }
 
@@ skipping 111 matching lines @@
   content::BrowserAccessibilityState::GetInstance()->EnableAccessibility();
   ui_test_utils::NavigateToURL(browser(), GURL("data:text/html,HelloWorld"));
   PrintPreview();
   WebContents* preview_dialog = GetPrintPreviewDialog();
   WaitForAccessibilityTreeToContainNodeWithName(preview_dialog, "HelloWorld");
 }
 
 }  // namespace
 
 #endif  // !defined(OS_ANDROID)