Remove the extension install dialog black border.

chrome/browser/ui/views/extensions/extension_install_dialog_view.cc

Index: chrome/browser/ui/views/extensions/extension_install_dialog_view.cc
diff --git a/chrome/browser/ui/views/extensions/extension_install_dialog_view.cc b/chrome/browser/ui/views/extensions/extension_install_dialog_view.cc
index f9aa70d6a4ed2038d0619b24d9870be2a0c7c853..536874bb124aafff024ce384d4d52117294c3828 100644
--- a/chrome/browser/ui/views/extensions/extension_install_dialog_view.cc
+++ b/chrome/browser/ui/views/extensions/extension_install_dialog_view.cc
@@ -185,9 +185,9 @@ void ShowExtensionInstallDialogImpl(
     ExtensionInstallPrompt::Delegate* delegate,
     const ExtensionInstallPrompt::Prompt& prompt) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  views::Widget::CreateWindowWithParent(
+  views::DialogDelegate::CreateDialogWidget(
       new ExtensionInstallDialogView(show_params.navigator, delegate, prompt),
-      show_params.parent_window)->Show();
+      NULL, show_params.parent_window)->Show();
 }
 
 }  // namespace