Intermittent timeout in /_mozilla/mozilla/mozbrowser/private_browsing.html, /html/browsers/history/the-location-interface/location_reload.html, and /_mozilla/mozilla/mozbrowser/mozbrowsershowmodalprompt_event.html

[jdm]

  ▶ TIMEOUT [expected OK] /_mozilla/mozilla/mozbrowser/private_browsing.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ ALERT: private=active private=active
  └ ALERT:

  ▶ Unexpected subtest result in /_mozilla/mozilla/mozbrowser/private_browsing.html:
  │ TIMEOUT [expected PASS] Private browsing
  └   → Test timed out

  ▶ TIMEOUT [expected OK] /html/browsers/history/the-location-interface/location_reload.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  └ 3.3 (Core Profile) Mesa 12.0.1

  ▶ Unexpected subtest result in /html/browsers/history/the-location-interface/location_reload.html:
  │ TIMEOUT [expected PASS] location_reload
  └   → Test timed out

  ▶ TIMEOUT [expected OK] /_mozilla/mozilla/mozbrowser/mozbrowsershowmodalprompt_event.html
  │ 
  │ VMware, Inc.
  │ Gallium 0.4 on softpipe
  │ 3.3 (Core Profile) Mesa 12.0.1
  │ ALERT: my alert message
  │ ALERT:
  └ ALERT: my alert message