Clean WebViewTempTrustTokens field trial test config

The experiment has ended.

Bug: 1297584
Change-Id: Ic6dd9a17542e7e06adc2d6120fb7494b0930f6a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3669796
Commit-Queue: Michael Bai <michaelbai@chromium.org>
Reviewed-by: Michael Bai <michaelbai@chromium.org>
Auto-Submit: Hazem Ashmawy <hazems@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1007885}
NOKEYCHECK=True
GitOrigin-RevId: d2cfb41027c99c65e137922c08e5c2e8640f7bae
1 file changed