Update dart2js unit tests to dart_parser and dart_scanner.

tests/compiler/dart2js/parser_test.dart

 // Copyright (c) 2011, 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.
 
 import "package:expect/expect.dart";
 import 'parser_helper.dart';
 import 'package:compiler/src/tree/tree.dart';
 
 void testStatement(String statement) {
   Node node = parseStatement(statement);
@@ skipping 288 matching lines @@
 class Collector extends DiagnosticReporter {
   int token = -1;
 
   void reportFatalError(Token token) {
     this.token = token.kind;
     throw this;
   }
 
   void reportError(DiagnosticMessage message,
       [List<DiagnosticMessage> infos = const <DiagnosticMessage>[]]) {
-    reportFatalError(message.spannable);
+    assert(token != -1);
+    throw this;
+  }
+
+  spanFromToken(Token token) {
+    this.token = token.kind;
   }
 
   void log(message) {
     print(message);
   }
 
   noSuchMethod(Invocation invocation) {
     throw 'unsupported operation';
   }
 
@@ skipping 60 matching lines @@
   testConditionalExpression();
   testNullOperators();
   testAssignment();
   testIndex();
   testPostfix();
   testOperatorParse();
   testMissingCloseParen();
   testMissingCloseBraceInClass();
   testUnmatchedAngleBracket();
 }