Firefox overlay is seen opened even if Import Overlay is Cancelled.

chrome/browser/ui/views/importer/import_lock_dialog_view.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_IMPORTER_IMPORT_LOCK_DIALOG_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_IMPORTER_IMPORT_LOCK_DIALOG_VIEW_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "ui/views/view.h"
 #include "ui/views/window/dialog_delegate.h"
 
 namespace views {
 class Label;
 }
 
 // ImportLockDialogView asks the user to shut down Firefox before starting the
 // profile import.
 class ImportLockDialogView : public views::DialogDelegateView {
  public:
   static void Show(gfx::NativeWindow parent,
                    const base::Callback<void(bool)>& callback);
+  static void Hide();
 
  private:
   explicit ImportLockDialogView(const base::Callback<void(bool)>& callback);
   ~ImportLockDialogView() override;
 
   // views::View:
   gfx::Size GetPreferredSize() const override;
   void Layout() override;
 
   // views::DialogDelegate:
   base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
   base::string16 GetWindowTitle() const override;
   bool Accept() override;
   bool Cancel() override;
 
  private:
   views::Label* description_label_;
-
+  static views::Widget* m_widget;

[Ilya Sherman, 2017/03/27 15:21:52]

nit: Please move this to the implementation file, name it g_widget, and document
it.

[nikhil.sahni, 2017/03/28 11:22:00]

Done.

   // Called with the result of the dialog.
   base::Callback<void(bool)> callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ImportLockDialogView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_IMPORTER_IMPORT_LOCK_DIALOG_VIEW_H_