Turn error into warning for non-static member access through the class.

sdk/lib/_internal/compiler/implementation/elements/modelx.dart

 // Copyright (c) 2013, 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 elements.modelx;
 
 import 'dart:uri';
 import 'dart:collection' show LinkedHashMap;
 
 import 'elements.dart';
@@ skipping 997 matching lines @@
     if (getter != null) {
       return new Modifiers.withFlags(
           getter.modifiers.nodes,
           getter.modifiers.flags | Modifiers.FLAG_ABSTRACT);
     } else {
       return new Modifiers.withFlags(
           setter.modifiers.nodes,
           setter.modifiers.flags | Modifiers.FLAG_ABSTRACT);
     }
   }
+
+  bool isInstanceMember() {
+    return isMember() && !modifiers.isStatic();
+  }
 }
 
 // TODO(johnniwinther): [FunctionSignature] should be merged with
 // [FunctionType].
 class FunctionSignatureX implements FunctionSignature {
   final Link<Element> requiredParameters;
   final Link<Element> optionalParameters;
   final DartType returnType;
   final int requiredParameterCount;
   final int optionalParameterCount;
@@ skipping 960 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }