android: Remove feature flag for SurfaceControl.

The feature has been enabled on Android since M77. This change does the
clean up for removing the associated feature flags now.

R=ericrk@chromium.org, boliu@chromium.org

Change-Id: I4c40bcd27e6f690507e75c1807a14eefe74f41c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1955856
Commit-Queue: Khushal <khushalsagar@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722602}
7 files changed