Use MemberElement instead of Element in function sets and selectors.

pkg/compiler/lib/src/dump_info.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 dump_info;
 
 import 'dart:convert'
     show ChunkedConversionSink, JsonEncoder, StringConversionSink;
 
 import 'package:dart2js_info/info.dart';
@@ skipping 244 matching lines @@
       signature.forEachParameter((parameter) {
         parameters.add(new ParameterInfo(parameter.name,
             '${_resultOf(parameter).type}', '${parameter.node.type}'));
       });
     }
 
     String returnType = null;
     // TODO(sigmund): why all these checks?
     if (element.isInstanceMember &&
         !element.isAbstract &&
-        closedWorld.allFunctions.contains(element)) {
+        closedWorld.allFunctions.contains(element as MemberElement)) {
       returnType = '${element.type.returnType}';
     }
     String inferredReturnType = '${_resultOf(element).returnType}';
     String sideEffects = '${closedWorld.getSideEffectsOfElement(element)}';
 
     int inlinedCount = compiler.dumpInfoTask.inlineCount[element];
     if (inlinedCount == null) inlinedCount = 0;
 
     FunctionInfo info = new FunctionInfo(
         name: name,
@@ skipping 325 matching lines @@
 
     ChunkedConversionSink<Object> sink = encoder.startChunkedConversion(
         new StringConversionSink.fromStringSink(buffer));
     sink.add(new AllInfoJsonCodec().encode(result));
     compiler.reporter.reportInfo(NO_LOCATION_SPANNABLE, MessageKind.GENERIC, {
       'text': "View the dumped .info.json file at "
           "https://dart-lang.github.io/dump-info-visualizer"
     });
   }
 }