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Guard the 'testing' import (and therefore all tests) behind
build_with_chromium, so that projects using the chromium absl build
(e.g. V8) don't have to add a dependency on 'testing'.

Change-Id: Ie4427fe1aebddd14a0c773fa1bc5938e56d6d193
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461312
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815552}