Revert "Remove SkFAIL."

This reverts commit 91b6ce3d80ae78816de2da3138df3c44bccd9671.

Reason for revert: Broke all the builders!
Original change's description:
> Remove SkFAIL.
> 
> This macro just forwards to SK_ABORT. It appears there are now no users.
> 
> Change-Id: Iab02109749eb9674a5f5c61752ef0588398d1b27
> Reviewed-on: https://skia-review.googlesource.com/35520
> Reviewed-by: Derek Sollenberger <djsollen@google.com>
> Commit-Queue: Ben Wagner <bungeman@google.com>

TBR=djsollen@google.com,bungeman@google.com

Change-Id: I7afcd127c8aa07b0147bc9c980918f597378ffef
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/35740
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed