Retrieve the list of all extensions that this context has access to (see
HasExtension). |extension_ids| will be populated with the list of
extension ID values. Returns true (1) on success. This function must be
called on the browser process UI thread.
Retrieve the list of all extensions that this context has access to (see HasExtension). |extension_ids| will be populated with the list of extension ID values. Returns true (1) on success. This function must be called on the browser process UI thread.