Remove (unused) context option to remove shader swizzling

Bug: skia:
Change-Id: I0372f7782124c096370b42624b6c0a3aff8a90b0
Reviewed-on: https://skia-review.googlesource.com/40101
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed