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* When users click the "Run safety check" button, safety check has a 1s
  delay before it runs the actual safety check. This is done to ensure
  that the "running" state of safety check children is shown to users
  for at least 1s.
* If users reload the Settings page in that 1s delay the browser
  crashes with crbug.com/1096965.
* This fix makes safety check ensure that JS is still allowed after the
  delay, before it runs the actual checks.

Bug: 1096965
Change-Id: I8ab45e4e561ba051a87019d41af3ac7a6c00162e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254138Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780397}