ignore `@proxy` in strong mode

pkg/analyzer/test/src/task/strong/strong_test_helper.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.
 
 // TODO(jmesserly): this file needs to be refactored, it's a port from
 // package:dev_compiler's tests
 library analyzer.test.src.task.strong.strong_test_helper;
 
 import 'dart:async';
 
@@ skipping 327 matching lines @@
         collector.errors = errors;
 
         var source = unit.source;
         if (source.uri.scheme == 'dart') {
           continue;
         }
 
         var analysisResult = await _resolve(source);
 
         errors.addAll(analysisResult.errors.where((e) =>
-            // TODO(jmesserly): these are usually intentional dynamic calls.
-            e.errorCode.name != 'UNDEFINED_METHOD' &&
             // We don't care about any of these:
             e.errorCode != HintCode.UNUSED_ELEMENT &&
             e.errorCode != HintCode.UNUSED_FIELD &&
             e.errorCode != HintCode.UNUSED_IMPORT &&
             e.errorCode != HintCode.UNUSED_LOCAL_VARIABLE &&
             e.errorCode != TodoCode.TODO));
         _expectErrors(analysisOptions, analysisResult.unit, errors);
       }
     }
 
@@ skipping 114 matching lines @@
   @override
   Source resolveAbsolute(Uri uri, [Uri actualUri]) {
     if (uri.scheme == 'package') {
       return (provider.getResource(
               provider.convertPath('/packages/' + uri.path)) as File)
           .createSource(uri);
     }
     return super.resolveAbsolute(uri, actualUri);
   }
 }