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This fixes a regression from [1], which accidentally modified CrOS'
User-Agent string.

Bug: 1061132
Change-Id: Ib42fe7eb840ceab38dba9a29d498b5c9ed041fa0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2102554Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Yoav Weiss <yoavweiss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750520}