Make JavaScript alert and confirm dialog boxes driveable by keyboard

chrome/browser/cocoa/js_modal_dialog_cocoa.mm

 // Copyright (c) 2010 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/cocoa/js_modal_dialog_cocoa.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "app/l10n_util_mac.h"
 #include "app/message_box_flags.h"
@@ skipping 165 matching lines @@
   }
 }
 
 void JSModalDialogCocoa::ShowAppModalDialog() {
   [alert_
       beginSheetModalForWindow:nil  // nil here makes it app-modal
                  modalDelegate:helper_.get()
                 didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:)
                    contextInfo:this];
 
-  if ([helper_ textField])
-    [[alert_ window] makeFirstResponder:[helper_ textField]];
+  if ([alert_ accessoryView])
+    [[alert_ window] makeFirstResponder:[alert_ accessoryView]];
 }
 
 void JSModalDialogCocoa::ActivateAppModalDialog() {
 }
 
 void JSModalDialogCocoa::CloseAppModalDialog() {
   DCHECK([alert_ isKindOfClass:[NSAlert class]]);
   [NSApp endSheet:[alert_ window]];
   alert_ = NULL;
 }
@@ skipping 11 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeAppModalDialog, public:
 
 // static
 NativeAppModalDialog* NativeAppModalDialog::CreateNativeJavaScriptPrompt(
     JavaScriptAppModalDialog* dialog,
     gfx::NativeWindow parent_window) {
   return new JSModalDialogCocoa(dialog);
 }