remove unneeded asACompose

Bug: skia:8941
Change-Id: I020d5c00f18527ef3564a72a55d3326d647006ac
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205302
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
3 files changed