Some MaybeHandles related cleanups.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index e88e91aea07b528278009358dbe2e66ff366d928..628a3fb3d1541c6e0c366fc7e32b8cb75dc26164 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -3398,9 +3398,12 @@ static inline bool ObjectSetAccessor(Object* obj,
       name, getter, setter, data, settings, attributes, signature);
   if (info.is_null()) return false;
   bool fast = Utils::OpenHandle(obj)->HasFastProperties();
-  i::Handle<i::Object> result =
-      i::JSObject::SetAccessor(Utils::OpenHandle(obj), info);
-  if (result.is_null() || result->IsUndefined()) return false;
+  i::Handle<i::Object> result;
+  ASSIGN_RETURN_ON_EXCEPTION_VALUE(
+      isolate, result,
+      i::JSObject::SetAccessor(Utils::OpenHandle(obj), info),
+      false);
+  if (result->IsUndefined()) return false;
   if (fast) i::JSObject::TransformToFastProperties(Utils::OpenHandle(obj), 0);
   return true;
 }