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The CL https://crrev.com/c/2107558 renames the legacy Protocol global
to ProtocolClient. Web tests that use this globa need to be temporarily
disabled so the CL can land.

R=tvanderlippe@chromium.org

Bug: chromium:1011811
Change-Id: I11cfb39cb5682a198143920869fe32e006357adc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2109690
Auto-Submit: Simon Zünd <szuend@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751643}