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This feature flag is duplicated in previews_features.h and wasn't
being referenced in code or tests.

Change-Id: Iffe553bc9359f03745814416cabb1c0d2bdbe0fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845967
Auto-Submit: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703922}