remove SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF flag and code

Bug: skia:
Change-Id: I234d221d685a6feab891cbca84869177b4a954bb
Reviewed-on: https://skia-review.googlesource.com/11404
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed