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

runtime/vm/debugger.cc

Index: runtime/vm/debugger.cc
diff --git a/runtime/vm/debugger.cc b/runtime/vm/debugger.cc
index b30a33142820226ed76e0c6c3a60d554a9c90760..13a91751bc024dd5b23d0a3fb51365635bea5465 100644
--- a/runtime/vm/debugger.cc
+++ b/runtime/vm/debugger.cc
@@ -1071,12 +1071,14 @@ RawObject* ActivationFrame::Evaluate(const String& expr) {
                         Array::Handle(Array::MakeArray(param_values)));
   } else {
     const Object& receiver = Object::Handle(GetReceiver());
+    const Class& method_cls = Class::Handle(function().origin());
     ASSERT(receiver.IsInstance() || receiver.IsNull());
     if (!(receiver.IsInstance() || receiver.IsNull())) {
       return Object::null();
     }
     const Instance& inst = Instance::Cast(receiver);
-    return inst.Evaluate(expr,
+    return inst.Evaluate(method_cls,
+                         expr,
                          Array::Handle(Array::MakeArray(param_names)),
                          Array::Handle(Array::MakeArray(param_values)));
   }