Remove support for remaining deprecated features.

tests/compiler/dart2js/deprecated_features_test.dart

-// Copyright (c) 2012, 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 that deprecated language features are diagnosed correctly.
-
-import "package:expect/expect.dart";
-import 'dart:async';
-
-import '../../../sdk/lib/_internal/compiler/compiler.dart';
-import '../../utils/dummy_compiler_test.dart' as dummy;
-
-main() {
-  StringBuffer messages = new StringBuffer();
-  void handler(Uri uri, int begin, int end, String message, Diagnostic kind) {
-    if (kind == Diagnostic.VERBOSE_INFO) return;
-    if (identical(kind.name, 'source map')) return;
-    if (uri == null) {
-      messages.write('$kind: $message\n');
-    } else {
-      Expect.equals('main:${uri.path}', '$uri');
-      String source = TEST_SOURCE[uri.path];
-      Expect.isNotNull(source);
-      messages.write('$begin<${source.substring(begin, end)}>:${uri.path}:'
-                   '$kind: $message\n');
-    }
-  }
-
-  Future<String> provider(Uri uri) {
-    if (uri.scheme != "main") return dummy.provider(uri);
-    String source = TEST_SOURCE[uri.path];
-    Expect.isNotNull(source);
-    return new Future<String>.value(source);
-  }
-
-  String code = deprecatedFutureValue(
-      compile(new Uri(scheme: 'main'),
-              new Uri(scheme: 'lib', path: '/'),
-              new Uri(scheme: 'package', path: '/'),
-              provider, handler));
-  if (code == null) {
-    throw 'Compilation failed: ${messages}';
-  }
-  Expect.stringEquals(
-      // This string is composed of lines of the following format:
-      //
-      // offset<source>:path:kind: message
-      //
-      // "offset" is the character offset from the beginning of TEST_SOURCE.
-      // "source" is the substring of TEST_SOURCE that the compiler is
-      // indicating as erroneous.
-      // "path" is the URI path.
-      // "kind" is the result of calling toString on a [Diagnostic] object.
-      // "message" is the expected message as a [String].  This is a
-      // short-term solution and should eventually changed to include
-      // a symbolic reference to a MessageKind.
-      "",
-      messages.toString());
-}
-
-deprecatedMessage(feature) {
-  return
-    "warning: Warning: Deprecated language feature, $feature"
-    ", will be removed in a future Dart milestone.";
-}
-
-const Map<String, String> TEST_SOURCE =
-  const <String, String>{ '': """
-class Foo {
-}
-
-main() {
-  var a = new Foo();
-}
-""",
-  };