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/core/SkPath.cpp b/src/core/SkPath.cpp
index 0978305..1cc92a4 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -2437,7 +2437,7 @@
                 fLastVec = vec;
                 break;
             case kInvalid_DirChange:
-                SkFAIL("Use of invalid direction change flag");
+                SK_ABORT("Use of invalid direction change flag");
                 break;
         }
     }