[SPv175] Remove SlimmingPaintV175 feature and switch in Chromium

SlimmingPaintV175 has been enabled by default and shipped in M67.

Bug: 771643
Change-Id: Idffe4b85e93a2c1a854b32be78fcf377c94b661a
Reviewed-on: https://chromium-review.googlesource.com/1080154
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563680}
7 files changed