[PermissionBubble] identical ctor across platforms.

chrome/browser/ui/cocoa/website_settings/permission_bubble_cocoa.mm

 // Copyright 2014 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/cocoa/website_settings/permission_bubble_cocoa.h"
 
+#include "chrome/browser/ui/browser_window.h"
 #import "chrome/browser/ui/cocoa/base_bubble_controller.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h"
 #import "chrome/browser/ui/cocoa/website_settings/permission_bubble_controller.h"
 #import "chrome/browser/ui/website_settings/permission_bubble_view.h"
 #include "content/public/browser/web_contents.h"
 #import "ui/base/cocoa/nsview_additions.h"
 
-PermissionBubbleCocoa::PermissionBubbleCocoa(NSWindow* parent_window)
-    : parent_window_(parent_window), delegate_(NULL), bubbleController_(nil) {}
+PermissionBubbleCocoa::PermissionBubbleCocoa(Browser* browser)
+    : parent_window_(nil), delegate_(nullptr), bubbleController_(nil) {
+  // Browser is allowed to be nullptr for testing purposes.
+  if (browser)
+    parent_window_ = browser->window()->GetNativeWindow();
+}
 
 PermissionBubbleCocoa::~PermissionBubbleCocoa() {
   if (delegate_)
     delegate_->SetView(NULL);
 }
 
 void PermissionBubbleCocoa::Show(
     const std::vector<PermissionBubbleRequest*>& requests,
     const std::vector<bool>& accept_state) {
   DCHECK(parent_window_);
@@ skipping 67 matching lines @@
     // will have a location_bar_bridge but not have a location bar.
     return location_bar_bridge->browser()->SupportsWindowFeature(
         Browser::FEATURE_LOCATIONBAR);
   }
   return false;
 }
 
 info_bubble::BubbleArrowLocation PermissionBubbleCocoa::GetArrowLocation() {
   return HasLocationBar() ? info_bubble::kTopLeft : info_bubble::kNoArrow;
 }