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CSSStickyPosition runtime flag has been shipped as stable from at least
m56. This patch removes the flag and make the dependent code
unconditional.

BUG=402536

Change-Id: I325da511415dd2d7aad7b1602e32bc8205489ac0
Reviewed-on: https://chromium-review.googlesource.com/738773Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: meade_UTC10 <meade@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung.kim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512771}