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This CL introduces a --force-disable-variation-ids parameter to prevent
variation ids and trigger variation ids from being sent via the X-Client-Data
request header for debugging purposes.

Bug: 1027576
Change-Id: Iacaaee31b1a62e50cc9b61a709cca5651038ddf4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930958
Commit-Queue: Dominic Battré <battre@chromium.org>
Auto-Submit: Dominic Battré <battre@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718687}