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The config "invert_fieldtrials" was missing.

TBR=martiniss@chromium.org

Bug: 1099916
Change-Id: Ia32c6d76e85e849471c6ab971afffded9d0c9570
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2490542Reviewed-by: Haiyang Pan <hypan@google.com>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#819462}