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This CL removes the "externalfile" scheme support from URLLoaderFactories for
service worker updated script loading. The scheme is used for loading files from
ChromeOS-specific local file systems (e.g., "Downloads" and "removable"):
https://cs.chromium.org/chromium/src/chrome/browser/chromeos/fileapi/file_system_backend.h?rcl=7bd9f2e138d37076a1ed3380126be8d00ae3837c&l=38

Service workers never support the scheme:
https://cs.chromium.org/chromium/src/chrome/common/chrome_content_client.cc?rcl=013d0ec7da2f2c1b4c78af14fa1bdc83290dfb35&l=645
https://cs.chromium.org/chromium/src/content/browser/service_worker/embedded_worker_instance.cc?l=1092-1095&rcl=183f7e64155459d1c5f50155234a176e4fce7b3f

See the following comment for the context:
https://chromium-review.googlesource.com/c/chromium/src/+/1669251/7/chrome/browser/chrome_content_browser_client.cc#4893

Bug: 648295, 964229
Change-Id: I4d18bb972f38eba4498b109e595627a43cfdc6dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798102
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695542}