Don't call dinvoke on Object methods

lib/src/codegen/js_codegen.dart

 // Copyright (c) 2015, 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.
 
 library dev_compiler.src.codegen.js_codegen;
 
 import 'dart:collection' show HashSet, HashMap;
 import 'dart:io' show Directory, File;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
@@ skipping 1715 matching lines @@
       return _visitGet(node.prefix, node.identifier);
     }
   }
 
   @override
   visitPropertyAccess(PropertyAccess node) =>
       _visitGet(_getTarget(node), node.propertyName);
 
   /// Shared code for [PrefixedIdentifier] and [PropertyAccess].
   _visitGet(Expression target, SimpleIdentifier name) {
-    if (rules.isDynamicTarget(target)) {
+    if (rules.isDynamicGet(target, name.name)) {
       return js.call(
           'dart.dload(#, #)', [_visit(target), js.string(name.name, "'")]);
     } else {
       var e = name.staticElement;
       return js.call('#.#', [
         _visit(target),
         _jsMemberName(name.name, isStatic: e is ExecutableElement && e.isStatic)
       ]);
     }
   }
@@ skipping 637 matching lines @@
 
     // TODO(jmesserly): in many cases marking the end will be unncessary.
     printer.mark(_location(node.end));
   }
 
   String _getIdentifier(AstNode node) {
     if (node is SimpleIdentifier) return node.name;
     return null;
   }
 }