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This makes browser_tests and unit_tests use FlexNG. It's required before
launching a stable experiment.

Bug: 845235, 1062484
Change-Id: If5e9672bcf11c62d8ff92f1939608d8ab969682b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2205975Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: David Grogan <dgrogan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771070}