Update dart2js unit tests to dart_parser and dart_scanner.

tests/compiler/dart2js/incremental/hello_test.dart

-// Copyright (c) 2014, 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.
-
-// Test a sequence of modifications to hello-world which used to cause problems
-// on Try Dart.
-
-import 'dart:io' show Platform;
-
-import 'dart:async' show Future;
-
-import 'package:dart2js_incremental/dart2js_incremental.dart'
-    show IncrementalCompiler;
-
-import 'package:compiler/compiler.dart' show Diagnostic;
-
-import 'package:compiler/src/null_compiler_output.dart' show NullCompilerOutput;
-
-import 'package:compiler/src/old_to_new_api.dart'
-    show LegacyCompilerDiagnostics;
-
-import 'package:async_helper/async_helper.dart' show asyncTest;
-
-import 'package:expect/expect.dart' show Expect;
-
-import '../memory_source_file_helper.dart' show MemorySourceFileProvider;
-
-var tests = {
-  '/test1.dart': '''
-var greeting = "Hello, World!";
-
-void main() {
-  print(greeting);
-}
-''',
-  '/test2.dart': '''
-va greeting = "Hello, World!";
-
-void main() {
-  print(greeting);
-}
-''',
-  '/test3.dart': '''
- greeting = "Hello, World!";
-
-void main() {
-  print(greeting);
-}
-''',
-  '/test4.dart': '''
-in greeting = "Hello, World!";
-
-void main() {
-  print(greeting);
-}
-''',
-  '/test5.dart': '''
-int greeting = "Hello, World!";
-
-void main() {
-  print(greeting);
-}
-''',
-};
-
-var testResults = {
-  '/test1.dart': true,
-  '/test2.dart': true,
-  '/test3.dart': false,
-  '/test4.dart': false,
-  '/test5.dart': true,
-};
-
-main() {
-  Uri libraryRoot = Uri.base.resolve('sdk/');
-  Uri packageConfig = Uri.base.resolve('.packages');
-  MemorySourceFileProvider provider = new MemorySourceFileProvider(tests);
-  asyncTest(() => runTests(libraryRoot, packageConfig, provider));
-}
-
-Future runTests(
-    Uri libraryRoot, Uri packageConfig, MemorySourceFileProvider provider) {
-  IncrementalCompiler compiler = new IncrementalCompiler(
-      diagnosticHandler: new LegacyCompilerDiagnostics(handler),
-      inputProvider: provider,
-      outputProvider: const NullCompilerOutput(),
-      options: ['--analyze-main'],
-      libraryRoot: libraryRoot,
-      packageConfig: packageConfig);
-
-  return Future.forEach(tests.keys, (String testName) {
-    Uri testUri = Uri.parse('memory:$testName');
-    return compiler.compile(testUri).then((bool success) {
-      Expect.equals(testResults[testName], success,
-          'Compilation unexpectedly ${success ? "succeed" : "failed"}.');
-    });
-  });
-}
-
-void handler(Uri uri, int begin, int end, String message, Diagnostic kind) {
-  if (kind != Diagnostic.VERBOSE_INFO) {
-    print('$uri:$begin:$end:$message:$kind');
-  }
-}