Remove some unused sample count caps

Change-Id: I4acb620b4b7b4c5bd83d7c7d65808ca8ebbd6804
Reviewed-on: https://skia-review.googlesource.com/101360
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
7 files changed