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This FYI bot was using the --isolate-extensions flag, which has been
removed after we shipped this mode in M56.  Switch its tests in
chromium.fyi.json to --site-per-process, which also brings them in
sync with how the layout tests already run on this bot, according to
/build/scripts/slave/recipe_modules/chromium_tests/chromium_fyi.py.

Bug: 417518
Change-Id: I668673b2192ce94f321dff91b8bbcfb9f31c6800
Reviewed-on: https://chromium-review.googlesource.com/701280Reviewed-by: Charlie Reis <creis@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506753}