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Also remove gpu_perftests isolate target since it apparently
isn't used anymore as a result of this change (plus the
work in crbug.com/921353 set this up to be run on Nexus 5
as part of the performance_test_suite isolate)
(and PRESUBMIT told me to).

Bug: 1042439
Change-Id: I35518250466a68ebcaa0a2c195f8ffdc8d4dd8b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003767Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732474}