Replace SkFAIL with SK_ABORT.

SkFAIL is a legacy macro which is just SK_ABORT. This CL mechanically
changes uses of SkFAIL to SK_ABORT in preparation for its removal. The
related sk_throw macro will be changed independently, due to needing to
actually clean up its users.

Change-Id: Id70b5c111a02d2458dc60c8933f444df27d9cebb
Reviewed-on: https://skia-review.googlesource.com/35284
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
diff --git a/src/gpu/GrFragmentProcessor.h b/src/gpu/GrFragmentProcessor.h
index 29a302b..8bf30d5 100644
--- a/src/gpu/GrFragmentProcessor.h
+++ b/src/gpu/GrFragmentProcessor.h
@@ -319,7 +319,7 @@
 
 private:
     virtual GrColor4f constantOutputForConstantInput(GrColor4f /* inputColor */) const {
-        SkFAIL("Subclass must override this if advertising this optimization.");
+        SK_ABORT("Subclass must override this if advertising this optimization.");
         return GrColor4f::TransparentBlack();
     }