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This switch was added in case of unexpected failures in stable. Since
it's now been running without any reported crashes since M78, remove it.

TBR=hnakashima@chromium.org

Fixed: 998990
Change-Id: I3bd5a55d7860d0a4a1374c33e5f0bd620019615b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013624
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Gang Wu <gangwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733807}