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We no longer need to support running with CORB disabled for
*all* extensions:

1. The BypassCorbOnlyForExtensionsAllowlist feature has shipped in M73.

2. Distributing allowlisted extensions via field trial param does not
   apply to M77+ (according to the BypassCorbExtensionsAllowlist.gcl
   config).

After this CL it is no longer possible to force a separate
URLLoaderFactory (with disabled CORB) for *all* content scripts by
launching Chrome with
--disable-features=BypassCorbOnlyForExtensionsAllowlist

After this CL it is still possible to avoid separate content script
URLLoaderFactories by launching Chrome with
--force-empty-corb-allowlist

Bug: 846346
Change-Id: Ia1264b318dd8c389bf8cb58041dd503a4dca5b6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774889
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692251}