Enable external protocol dialog on Windows Aura

chrome/browser/ui/views/external_protocol_dialog.cc

Index: chrome/browser/ui/views/external_protocol_dialog.cc
diff --git a/chrome/browser/ui/views/external_protocol_dialog.cc b/chrome/browser/ui/views/external_protocol_dialog.cc
index 3405c5cb40a9b1940e5f872dd57be4bac45b3624..a7ae8af2b54f0519e5d61deea7ffe9c609200b4e 100644
--- a/chrome/browser/ui/views/external_protocol_dialog.cc
+++ b/chrome/browser/ui/views/external_protocol_dialog.cc
@@ -156,13 +156,10 @@ ExternalProtocolDialog::ExternalProtocolDialog(WebContents* web_contents,
       l10n_util::GetStringUTF16(IDS_EXTERNAL_PROTOCOL_CHECKBOX_TEXT));
 
   // Dialog is top level if we don't have a web_contents associated with us.
-  HWND root_hwnd = NULL;
-  if (web_contents_) {
-    root_hwnd = GetAncestor(web_contents_->GetView()->GetContentNativeView(),
-                            GA_ROOT);
-  }
-
-  CreateBrowserModalDialogViews(this, root_hwnd)->Show();
+  gfx::NativeWindow parent_window = NULL;
+  if (web_contents_)
+    parent_window = web_contents_->GetView()->GetTopLevelNativeWindow();
+  CreateBrowserModalDialogViews(this, parent_window)->Show();
 }
 
 // static