remove equality kind from compare nil ic

src/v8.h

Index: src/v8.h
diff --git a/src/v8.h b/src/v8.h
index cd25dc76ea46edf52d372852cc530a6c750f8ccc..e906035c56927998bf7630406833deba932e32ad 100644
--- a/src/v8.h
+++ b/src/v8.h
@@ -146,10 +146,6 @@ class V8 : public AllStatic {
 enum NilValue { kNullValue, kUndefinedValue };
 
 
-// JavaScript defines two kinds of equality.
-enum EqualityKind { kStrictEquality, kNonStrictEquality };
-
-
 } }  // namespace v8::internal
 
 namespace i = v8::internal;