All strong mode cleaning of dart2js.

tests/compiler/dart2js/parser_helper.dart

 // Copyright (c) 2016, 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 parser_helper;
 
 import 'package:expect/expect.dart';
 
 import 'package:compiler/src/elements/elements.dart';
+import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/id_generator.dart';
 import 'package:compiler/src/tree/tree.dart';
 import 'package:compiler/src/parser/element_listener.dart';
 import 'package:compiler/src/parser/node_listener.dart';
 import 'package:compiler/src/parser/diet_parser_task.dart';
 import 'package:front_end/src/fasta/parser.dart' hide parse;
 import 'package:front_end/src/fasta/scanner.dart' hide scan;
 import 'package:compiler/src/io/source_file.dart';
 import 'package:compiler/src/util/util.dart';
 
@@ skipping 19 matching lines @@
 
 import 'mock_compiler.dart';
 
 class LoggerCanceler extends DiagnosticReporter {
   DiagnosticOptions get options => const MockDiagnosticOptions();
 
   void log(message) {
     print(message);
   }
 
-  void internalError(node, String message) {
+  void internalError(Spannable node, message) {
     log(message);
   }
 
   SourceSpan spanFromSpannable(node) {
     throw 'unsupported operation';
   }
 
   SourceSpan spanFromToken(token) => null;
 
   void reportError(DiagnosticMessage message,
@@ skipping 12 matching lines @@
       [Map arguments = const {}]) {
     log(new Message(MessageTemplate.TEMPLATES[errorCode], arguments, false));
   }
 
   void reportHint(DiagnosticMessage message,
       [List<DiagnosticMessage> infos = const <DiagnosticMessage>[]]) {
     log(message);
     infos.forEach(log);
   }
 
-  withCurrentElement(Element element, f()) => f();
+  withCurrentElement(Entity element, f()) => f();
 
   @override
   DiagnosticMessage createMessage(Spannable spannable, MessageKind messageKind,
       [Map arguments = const {}]) {
     return new DiagnosticMessage(null, spannable,
         new Message(MessageTemplate.TEMPLATES[messageKind], arguments, false));
   }
 
   @override
   bool get hasReportedError => false;
@@ skipping 59 matching lines @@
       new IdGenerator());
   PartialParser parser = new PartialParser(listener);
   reporter.withCurrentElement(unit, () => parser.parseUnit(tokens));
   return unit.localMembers;
 }
 
 NodeList fullParseUnit(String source, {DiagnosticReporter reporter}) {
   return parseBodyCode(source, (parser, tokens) => parser.parseUnit(tokens),
       reporter: reporter);
 }