MacViews: Unify web contents modal dialog types

chrome/browser/ui/cocoa/constrained_web_dialog_delegate_mac.mm

 // Copyright (c) 2012 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/webui/constrained_web_dialog_delegate_base.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_custom_window.h"
@@ skipping 54 matching lines @@
   }
   WebDialogDelegate* GetWebDialogDelegate() override {
     return impl_->GetWebDialogDelegate();
   }
   void OnDialogCloseFromWebUI() override {
     return impl_->OnDialogCloseFromWebUI();
   }
   void ReleaseWebContentsOnDialogClose() override {
     return impl_->ReleaseWebContentsOnDialogClose();
   }
-  NativeWebContentsModalDialog GetNativeDialog() override {
-    return constrained_window_->GetNativeDialog();
-  }
+  NativeWebContentsModalDialog GetNativeDialog() override { return window_; }
   WebContents* GetWebContents() override { return impl_->GetWebContents(); }
   gfx::Size GetMinimumSize() const override {
     NOTIMPLEMENTED();
     return gfx::Size();
   }
   gfx::Size GetMaximumSize() const override {
     NOTIMPLEMENTED();
     return gfx::Size();
   }
   gfx::Size GetPreferredSize() const override {
@@ skipping 45 matching lines @@
 ConstrainedWebDialogDelegate* ShowConstrainedWebDialog(
         content::BrowserContext* browser_context,
         WebDialogDelegate* delegate,
         content::WebContents* web_contents) {
   // Deleted when the dialog closes.
   ConstrainedWebDialogDelegateViewMac* constrained_delegate =
       new ConstrainedWebDialogDelegateViewMac(
           browser_context, delegate, web_contents);
   return constrained_delegate;
 }