mark SkRasterPipelineBlitter final

This devirtualizes the call from blitAntiH to blitH,
and makes sure no future self calls will be virtual.

Change-Id: I2a277bbc1450a96e07794791792d59e5f806bde0
Reviewed-on: https://skia-review.googlesource.com/17418
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed