title: source map HTTP request does not send cookie header
body: <p>Regarding source maps, I came across a strange behavior in chromium (build 181620).
  In my app I'm using minified jquery and after logging-in, I started seeing HTTP requests for "jquery.min.map" in server log file. Those requests were lacking cookie headers (all other requests were fine).
  Those requests are not even exposed in net tab in Developer tools (which doesn't bug me that much).</p>
  
  <p>The point is, js files in this app are only supposed to be available to logged-in clients, so in this setup, the source maps either won't work or I'd have to change the location of source map to a public directory.</p>
  
  <p>My question is: is this a desired behavior (meaning - source map requests should not send cookies) or is it a bug in Chromium?</p>