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There seems to be a potential flake at the moment when loading service
workers on unpacked extensions in tests, related to
https://crbug.com/1146173

Adding a flag to allow file access stops the extension being reloaded
and avoids this issue for now.

Bug: 1146301
Change-Id: Ia952ec24fa501ed379a67f8c6cb2313eca5851cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527362Reviewed-by: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Tim Judkins <tjudkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826417}