Remove misleading comments that implied big-endian support in Skia.

Additional minor cleanup:
- Removed temporary #define that was no longer in service.

Change-Id: Ib444ed4d4a5c0959d0b8642da676eb2b3db41b22
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291897
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
2 files changed