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Moving the TrustTokenBrowsertest class into a header will allow
DevTools to re-use the functionality in its own browser tests for
upcoming Trust Token debugging features.

The CL https://crrev.com/c/2516225 is an example where DevTools
and TrustToken browsertests are combined.

R=davidvc@chromium.org

Bug: chromium:1141652
Change-Id: Ibd9d9a75738d17d9eb1cc33359063ad4bd99b860
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517947
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: David Van Cleve <davidvc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824353}