remove SK_API from namespaced enum

try to fix roll

Bug: skia:
Change-Id: I3022f23486e5c077f46711de520366f3ea90ef8d
Reviewed-on: https://skia-review.googlesource.com/17161
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed