clean up SK_LEGACY_HIGH_QUALITY_SCALING_CLAMP

After this rolls out, we can remove
-DSK_LEGACY_HIGH_QUALITY_SCALING_CLAMP from Google and Chromium,
finally.

Change-Id: Ie277843d5ab6e6e762b1b2eea1c23a40cca55a38
Reviewed-on: https://skia-review.googlesource.com/106622
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2 files changed