extensionSystem: Replace Shell.write_soup_message_to_stream with GBytes usage

https://bugzilla.gnome.org/show_bug.cgi?id=676837

src/shell-util.c

@@ -592,29 +592,6 @@ shell_util_get_week_start ()
   return week_start;
 }
 
-/**
- * shell_write_soup_message_to_stream:
- * @stream: a #GOutputStream
- * @message: a #SoupMessage
- * @error: location to store GError
- *
- * Write a string to a GOutputStream as binary data. This is a
- * workaround for the lack of proper binary strings in GJS.
- */
-void
-shell_write_soup_message_to_stream (GOutputStream *stream,
-                                    SoupMessage   *message,
-                                    GError       **error)
-{
-  SoupMessageBody *body;
-
-  body = message->response_body;
-
-  g_output_stream_write_all (stream,
-                             body->data, body->length,
-                             NULL, NULL, error);
-}
-
 /**
  * shell_write_string_to_stream:
  * @stream: a #GOutputStream

src/shell-util.h

@@ -25,10 +25,6 @@ char    *shell_util_normalize_and_casefold     (const char       *str);
 char    *shell_util_format_date                (const char       *format,
                                                 gint64            time_ms);
 
-void     shell_write_soup_message_to_stream    (GOutputStream    *stream,
-                                                SoupMessage      *message,
-                                                GError          **error);
-
 gboolean shell_write_string_to_stream          (GOutputStream    *stream,
                                                 const char       *str,
                                                 GError          **error);