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This change paves the way for limiting the set of experiment IDs
included in X-Client-Data headers sent in third-party contexts.

Bug: 1094303
Change-Id: Ib5b094e1fa9aa1e508d9b8f14886d69ce18cbfa4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363076Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799300}