Cancel uninstall if the uninstall dialog's parent window is destroyed

chrome/browser/ui/cocoa/extensions/extension_uninstall_dialog_cocoa.mm

 // Copyright (c) 2011 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/extensions/extension_uninstall_dialog.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include <string>
 
@@ skipping 18 matching lines @@
                                 gfx::NativeWindow parent,
                                 Delegate* delegate);
   ~ExtensionUninstallDialogCocoa() override;
 
  private:
   void Show() override;
 };
 
 ExtensionUninstallDialogCocoa::ExtensionUninstallDialogCocoa(
     Profile* profile,
-    gfx::NativeWindow parent,
     extensions::ExtensionUninstallDialog::Delegate* delegate)
-    : extensions::ExtensionUninstallDialog(profile, parent, delegate) {
+    : extensions::ExtensionUninstallDialog(profile, delegate) {
 }
 
 ExtensionUninstallDialogCocoa::~ExtensionUninstallDialogCocoa() {}
 
 void ExtensionUninstallDialogCocoa::Show() {
   NSAlert* alert = [[[NSAlert alloc] init] autorelease];
 
   NSButton* continueButton = [alert addButtonWithTitle:l10n_util::GetNSString(
       IDS_EXTENSION_PROMPT_UNINSTALL_BUTTON)];
   NSButton* cancelButton = [alert addButtonWithTitle:l10n_util::GetNSString(
@@ skipping 14 matching lines @@
     delegate_->ExtensionUninstallCanceled();
 }
 
 }  // namespace
 
 // static
 extensions::ExtensionUninstallDialog*
 extensions::ExtensionUninstallDialog::Create(Profile* profile,
                                              gfx::NativeWindow parent,
                                              Delegate* delegate) {
-  return new ExtensionUninstallDialogCocoa(profile, parent, delegate);
+  return new ExtensionUninstallDialogCocoa(profile, delegate);
 }