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This allows bundling of extension URL hosts by passing:
chrome-extension://extensionid/ as the host
to fully work (e.g., excluding local files from the bundle).

Bug: 1163956
Change-Id: Ib467c61c1bb507872292376b3508a10f72d8f076
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618561Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842286}