Remove several JSFunction delegator functions.

src/accessors.cc

Index: src/accessors.cc
diff --git a/src/accessors.cc b/src/accessors.cc
index 94e800a27c0a4c94b06085672de6dffdf9c16902..73270d187c5ed4ea7675ccc25adaab0e6cb00707 100644
--- a/src/accessors.cc
+++ b/src/accessors.cc
@@ -1321,7 +1321,7 @@ MaybeHandle<JSFunction> FindCaller(Isolate* isolate,
   // If caller is a built-in function and caller's caller is also built-in,
   // use that instead.
   JSFunction* potential_caller = caller;
-  while (potential_caller != NULL && potential_caller->IsBuiltin()) {
+  while (potential_caller != NULL && potential_caller->shared()->IsBuiltin()) {
     caller = potential_caller;
     potential_caller = it.next();
   }