Limit server-timing to https

fetch.bs

@@ -4299,7 +4299,8 @@ steps:
    <a for="fetch params">timing info</a>.</p></li>
   </ol>
  </li>
- <li><p>Otherwise, set <var>response</var>'s <a for=response>timing info</a>'s
+ <li><p>Otherwise, if <var>response</var>'s <a for=response>URL</a>'s <a for=url>scheme</a> is
+ "<code>https</code>", then set <var>response</var>'s <a for=response>timing info</a>'s
  <a for="fetch timing info">server timing headers</a> to the result of
  <a for="header list">getting, decoding, and splitting</a> `<code>Server-Timing</code>` from
  <var>response</var>'s <a for=response>header list</a>.</p></li>