Convert GrCrash->SkFAIL GrDebugCrash->SkDEBUGFAIL

R=robertphillips@google.com, reed@google.com, mtklein@google.com

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/257393004

git-svn-id: http://skia.googlecode.com/svn/trunk@14460 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkLightingImageFilter.cpp b/src/effects/SkLightingImageFilter.cpp
index b485ae1..24fdd0e 100644
--- a/src/effects/SkLightingImageFilter.cpp
+++ b/src/effects/SkLightingImageFilter.cpp
@@ -1115,7 +1115,7 @@
                                             random->nextU()));
         }
         default:
-            GrCrash();
+            SkFAIL("Unexpected value.");
             return NULL;
     }
 }