Make remaining dart2js unit tests pass.

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/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/partial_elements.dart';
+import 'package:compiler/src/parser/diet_parser_task.dart';
 import 'package:dart_parser/dart_parser.dart' hide parse;
 import 'package:dart_scanner/dart_scanner.dart' hide scan;
 import 'package:compiler/src/io/source_file.dart';
 import 'package:compiler/src/util/util.dart';
 
 import 'package:compiler/src/elements/modelx.dart'
     show CompilationUnitElementX, ElementX, LibraryElementX;
 
 import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/options.dart';
 import 'package:compiler/src/diagnostics/source_span.dart';
 import 'package:compiler/src/diagnostics/spannable.dart';
 import 'package:compiler/src/diagnostics/diagnostic_listener.dart';
 import 'package:compiler/src/diagnostics/messages.dart';
 import 'package:compiler/src/script.dart';
 
 import 'options_helper.dart';
 
 export 'package:dart_parser/dart_parser.dart' hide parse;
 export 'package:dart_scanner/dart_scanner.dart' hide scan;
 export 'package:compiler/src/diagnostics/diagnostic_listener.dart';
 export 'package:compiler/src/parser/node_listener.dart';
-export 'package:compiler/src/parser/partial_elements.dart';
+export 'package:compiler/src/parser/diet_parser_task.dart';
 export 'package:dart_scanner/src/token_constants.dart';
 
 class LoggerCanceler extends DiagnosticReporter {
   DiagnosticOptions get options => const MockDiagnosticOptions();
 
   void log(message) {
     print(message);
   }
 
   void internalError(node, String message) {
@@ skipping 102 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);
 }