Auto merge of #26016 - servo:jdm-patch-36, r=SimonSapin

Force alert message to its own line.

This should avoid timeouts in WPT caused by output that looks like:
```
 │ 0:00:00.542631465 10817 0x7f9ccc161630 WARN                 playbin gstplaybin2.c:4663:autoplug_select_cb:<playbin> Could not activate sink oss4sink
  │ ALSA lib confmisc.c:767:(parse_card) ALERT: RESULT: ["/html/semantics/embedded-content/media-elements/event_pause_noautoplay.html",0,null,null,[["audio events - pause",0,null,null],["video events - pause",0,null,null],["calling play() then pause() on non-autoplay audio should trigger pause event",0,null,null],["calling play() then pause() on non-autoplay video should trigger pause event",0,null,null]]]
  │ cannot find card '0'
```
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bors-servo 2020-03-23 14:14:15 -04:00 committed by GitHub
commit fcb99ae017
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@ -615,7 +615,7 @@ impl WindowMethods for Window {
let mut stderr = stderr.lock();
let stdout = stdout();
let mut stdout = stdout.lock();
writeln!(&mut stdout, "ALERT: {}", s).unwrap();
writeln!(&mut stdout, "\nALERT: {}", s).unwrap();
stdout.flush().unwrap();
stderr.flush().unwrap();
}