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The previous registration in SetupMobileFieldTrials was too early;
the g_browser_process is not initialized yet. This registration works.

Bug: 932578
Change-Id: If45b6b88c1be4c1025f9ecd6ee8e5efc5685bc9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1473174Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Auto-Submit: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638075}