VM: Evaluate-in-frame should happen in the scope of the method class, not the receiver class.

runtime/vm/service.cc

Index: runtime/vm/service.cc
diff --git a/runtime/vm/service.cc b/runtime/vm/service.cc
index 0caeb9c872e8dc3efeebf044a3ed0c1de6aff079..62048e0fd3b5db95a5b9415dcf05e37de591e981 100644
--- a/runtime/vm/service.cc
+++ b/runtime/vm/service.cc
@@ -2150,8 +2150,10 @@ static bool Evaluate(Thread* thread, JSONStream* js) {
     // We don't use Instance::Cast here because it doesn't allow null.
     Instance& instance = Instance::Handle(zone);
     instance ^= obj.raw();
+    const Class& receiver_cls = Class::Handle(zone, instance.clazz());
     const Object& result =
-        Object::Handle(zone, instance.Evaluate(expr_str,
+        Object::Handle(zone, instance.Evaluate(receiver_cls,
+                                               expr_str,
                                                Array::empty_array(),
                                                Array::empty_array()));
     result.PrintJSON(js, true);