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This CL enables Dice M2 by default in Chromium that have API keys
configured as those are mandatory for DICE.

It also ensures that unit and browser tests have DICE M2 enabled,
even for builds when the API keys are not configured.

Bug: 829220
Change-Id: I752bf7e9e03da0ddd33841e42ec1c550fcaf91c7
Reviewed-on: https://chromium-review.googlesource.com/1044210
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556057}