remove sse2::srcover_srgb_srgb

Change-Id: Icc570d8a8f1df1dea202e1d234433491122b9b67
Reviewed-on: https://skia-review.googlesource.com/18135
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
1 file changed