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The OriginTrialPolicy is not setup on the browser process, on Android,
on tests derived from BrowserTestBase.

This is normally done from ContentMain(). This function is not called
here, but reproduced more or less accurately by BrowserTestBase.

To install an OriginTrialPolicy from the ContentClient, this requires
accessing the ContentClient. So this patch is essentially exposing it
through GetContentClientForTesting() and use it.

Fixed: 1123953,1119555
Bug: 1123953,1119555
Change-Id: I403a391a84e8504c80d8df57212f347381d25c30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505979Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824106}