Revert Dart_PropagateError until I can track down the problems in

runtime/vm/ast.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/ast.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/isolate.h"
 #include "vm/object_store.h"
 
@@ skipping 420 matching lines @@
 const Instance* StaticGetterNode::EvalConstExpr() const {
   const String& getter_name =
       String::Handle(Field::GetterName(this->field_name()));
   const Function& getter_func =
       Function::Handle(this->cls().LookupStaticFunction(getter_name));
   if (getter_func.IsNull() || !getter_func.is_const()) {
     return NULL;
   }
   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