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This is making sure that the tests are passing when the flag to use the
UserAgent of the WebClients is enabled or disabled.

Bug: none
Change-Id: If61994b6c6ec13327475e4f2f525a93ea121ed1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332606
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795482}