Remove the external protocol dialog black border.

chrome/browser/chromeos/external_protocol_dialog.cc

Index: chrome/browser/chromeos/external_protocol_dialog.cc
diff --git a/chrome/browser/chromeos/external_protocol_dialog.cc b/chrome/browser/chromeos/external_protocol_dialog.cc
index a1feeacef883660f3b0fea0a1812a296f6cdfc95..3a0d2c2b03894d09e7998ba5a30f6b53f86d39a6 100644
--- a/chrome/browser/chromeos/external_protocol_dialog.cc
+++ b/chrome/browser/chromeos/external_protocol_dialog.cc
@@ -124,5 +124,5 @@ ExternalProtocolDialog::ExternalProtocolDialog(WebContents* web_contents,
     // Dialog is top level if we don't have a web_contents associated with us.
     parent_window = NULL;
   }
-  views::Widget::CreateWindowWithParent(this, parent_window)->Show();
+  views::DialogDelegate::CreateDialogWidget(this, NULL, parent_window)->Show();
 }