Remove border for URL input field.

Change-Id: I64a2267877262de7481e1de6b3ab1f144187fd00
(cherry picked from commit 9579da839986af50a2ea8803670f8cead4c6a24b)
diff --git a/src/com/google/appindexing/ui/AppIndexingDialog.java b/src/com/google/appindexing/ui/AppIndexingDialog.java
index 8776143..5ac297f 100644
--- a/src/com/google/appindexing/ui/AppIndexingDialog.java
+++ b/src/com/google/appindexing/ui/AppIndexingDialog.java
@@ -303,6 +303,7 @@
     @Override
     protected JTextField createEditorComponent() {
       JBTextField editor = new JBTextField();
+      editor.setBorder(null);
       editor.getEmptyText().setText(HINT_MESSAGE);
       return editor;
     }