Add chooser permission UI code for Mac

chrome/browser/ui/website_settings/chooser_bubble_delegate.cc

 // 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.
 
 #include "chrome/browser/ui/website_settings/chooser_bubble_delegate.h"
 
-ChooserBubbleDelegate::ChooserBubbleDelegate() {}
+#include "base/logging.h"
+
+ChooserBubbleDelegate::ChooserBubbleDelegate(Browser* browser)
+    : browser_(browser) {
+  DCHECK(browser_);
+}
 
 ChooserBubbleDelegate::~ChooserBubbleDelegate() {}
 
 std::string ChooserBubbleDelegate::GetName() const {
   return "ChooserBubble";
 }