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It turns out that we automatically origin-isolate web-platform.test
domains. This makes the web platform tests under
external/wpt/origin-isolation, for the opt-in origin isolation feature
(https://crbug.com/1042415), useless, since the opt-in does nothing.

This CL introduces a new virtual test suite, which toggles a new command
line flag to disable this automatic origin isolation of WPT domains.
When running this virtual test suite, then, the WPT domains will only be
origin-isolated when they are explicitly opted in by the test files, by
setting the Origin-Isolation header.

The tests are run exclusively in this virtual test suite, by adding
their default configuration to NeverFixTests.

Fixed: 1073181
Change-Id: I9db3285f1ac3a0e5b04e8d63694649d2dbe6419e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159536
Commit-Queue: Domenic Denicola <domenic@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#763371}