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This removes all checks for feature flags, removes the feature flags
themselves, and updates any affected tests.

Intent to Ship:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/-iAATJCpcNY

Bug: 704729
Change-Id: I69bfd29787ad5d3299991cfa1b77f33c597a8e57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1508092
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Commit-Queue: Peter Beverloo <peter@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638711}