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/tests/TextBlobTest.cpp b/tests/TextBlobTest.cpp
index d8d4865..f20e3e1 100644
--- a/tests/TextBlobTest.cpp
+++ b/tests/TextBlobTest.cpp
@@ -333,7 +333,7 @@
             }
         } break;
         default:
-            SkFAIL("unhandled positioning value");
+            SK_ABORT("unhandled positioning value");
         }
     }
 };