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Change the default behavior to enabled, update unit tests to match new
default behavior, and remove fieldtrial testing config.

Bug: 960305
Change-Id: I8f045648c73ab8787dddc2a75d576f23c13dac1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090451
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747480}