Revert Dart_PropagateError until I can track down the problems in

runtime/vm/ast.cc

Index: runtime/vm/ast.cc
===================================================================
--- runtime/vm/ast.cc	(revision 3821)
+++ runtime/vm/ast.cc	(working copy)
@@ -438,19 +438,17 @@
   }
   GrowableArray<const Object*> arguments;
   const Array& kNoArgumentNames = Array::Handle();
-  const Object& result =
-      Object::Handle(DartEntry::InvokeStatic(getter_func,
-                                             arguments,
-                                             kNoArgumentNames));
-  if (result.IsError() || result.IsNull()) {
-    // TODO(turnidge): We could get better error messages by returning
-    // the Error object directly to the parser.  This will involve
-    // replumbing all of the EvalConstExpr methods.
+  const Instance& field_value =
+      Instance::ZoneHandle(DartEntry::InvokeStatic(getter_func,
+                                                   arguments,
+                                                   kNoArgumentNames));
+  if (field_value.IsUnhandledException()) {
     return NULL;
   }
-  Instance& field_value = Instance::ZoneHandle();
-  field_value ^= result.raw();
-  return &field_value;
+  if (!field_value.IsNull()) {
+    return &field_value;
+  }
+  return NULL;
 }
 
 }  // namespace dart