Add chooser permission UI code for Mac

chrome/browser/usb/usb_chooser_bubble_delegate.h

 // Copyright 2015 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_USB_USB_CHOOSER_BUBBLE_DELEGATE_H_
 #define CHROME_BROWSER_USB_USB_CHOOSER_BUBBLE_DELEGATE_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/website_settings/chooser_bubble_delegate.h"
 #include "components/webusb/public/interfaces/webusb_permission_bubble.mojom.h"
 
 namespace content {
 class RenderFrameHost;
 }
 
 class Browser;
 
 // UsbChooserBubbleDelegate creates a chooser bubble for WebUsb.
 class UsbChooserBubbleDelegate : public ChooserBubbleDelegate {
  public:
   UsbChooserBubbleDelegate(
       Browser* browser,
       mojo::Array<device::usb::DeviceFilterPtr> device_filters,
       content::RenderFrameHost* render_frame_host,
       const webusb::WebUsbPermissionBubble::GetPermissionCallback& callback);
   ~UsbChooserBubbleDelegate() override;
 
-  // BubbleDelegate:
-  scoped_ptr<BubbleUi> BuildBubbleUi() override;
-
   // ChooserBubbleDelegate:
   void Select(int index) override;
   void Cancel() override;
   void Close() override;
 
  private:
-  Browser* browser_;
-
   DISALLOW_COPY_AND_ASSIGN(UsbChooserBubbleDelegate);
 };
 
 #endif  // CHROME_BROWSER_USB_USB_CHOOSER_BUBBLE_DELEGATE_H_