remove empty skia_for_chromium_defines

Bug: skia:
Change-Id: Ifac75b9b68e242170c23e7018f4b0437a9ef672f
Reviewed-on: https://skia-review.googlesource.com/c/184802
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed