Don't include source maps in release mode.

sdk/lib/_internal/pub/test/transformer/dart2js/includes_source_map_urls_test.dart

Index: sdk/lib/_internal/pub/test/transformer/dart2js/includes_source_map_urls_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/dart2js/includes_source_map_urls_test.dart b/sdk/lib/_internal/pub/test/transformer/dart2js/includes_source_map_urls_test.dart
deleted file mode 100644
index ee5587a21376abe18c856ba39d121f8588193d2f..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/transformer/dart2js/includes_source_map_urls_test.dart
+++ /dev/null
@@ -1,38 +0,0 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 pub_tests;
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration("includes proper URLs in generated JS and source map", () {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("web", [
-        d.file("main.dart", "void main() => print('hello');")
-      ])
-    ]).create();
-
-    schedulePub(args: ["build"],
-        output: new RegExp(r'Built 3 files to "build".'),
-        exitCode: 0);
-
-    d.dir(appPath, [
-      d.dir('build', [
-        d.dir('web', [
-          d.matcherFile('main.dart.js', allOf([
-            contains("# sourceMappingURL=main.dart.js.map"),
-            contains("@ sourceMappingURL=main.dart.js.map")
-          ])),
-          d.matcherFile('main.dart.js.map', contains('"file": "main.dart.js"'))
-        ])
-      ])
-    ]).validate();
-  });
-}