Revert of Revive experiment to isolate shell operations.

chrome/browser/win/chrome_select_file_dialog_factory.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_WIN_CHROME_SELECT_FILE_DIALOG_FACTORY_H_
 #define CHROME_BROWSER_WIN_CHROME_SELECT_FILE_DIALOG_FACTORY_H_
 
+#include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "ui/shell_dialogs/select_file_dialog_factory.h"
 
+namespace base {
+class SequencedTaskRunner;
+}  // namespace base
+
 // Implements a Select File dialog that delegates to a Metro file picker on
 // Metro and to a utility process otherwise. The utility process is used in
 // order to isolate the Chrome browser process from potential instability
 // caused by Shell extension modules loaded by GetOpenFileName.
 class ChromeSelectFileDialogFactory : public ui::SelectFileDialogFactory {
  public:
-  ChromeSelectFileDialogFactory();
+  // Uses |blocking_task_runner| to perform IPC with the utility process.
+  explicit ChromeSelectFileDialogFactory(
+      const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner);
   ~ChromeSelectFileDialogFactory() override;
 
   // ui::SelectFileDialogFactory implementation
   ui::SelectFileDialog* Create(ui::SelectFileDialog::Listener* listener,
                                ui::SelectFilePolicy* policy) override;
 
  private:
+  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeSelectFileDialogFactory);
 };
 
 #endif  // CHROME_BROWSER_WIN_CHROME_SELECT_FILE_DIALOG_FACTORY_H_