Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/test/build/copies_browser_js_with_dependency_override_test.dart

Index: sdk/lib/_internal/pub_generated/test/build/copies_browser_js_with_dependency_override_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/build/copies_browser_js_with_dependency_override_test.dart b/sdk/lib/_internal/pub_generated/test/build/copies_browser_js_with_dependency_override_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..de98aaa243584751583ba29fe6981fdece3a9a10
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/test/build/copies_browser_js_with_dependency_override_test.dart
@@ -0,0 +1,60 @@
+// Copyright (c) 2013, 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:scheduled_test/scheduled_test.dart';
+
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+import 'utils.dart';
+
+main() {
+  // This is a regression test for http://dartbug.com/16617.
+
+  initConfig();
+
+  integration(
+      "compiles dart.js and interop.js next to entrypoints when "
+          "browser is a dependency_override",
+      () {
+    // Dart2js can take a long time to compile dart code, so we increase the
+    // timeout to cope with that.
+    currentSchedule.timeout *= 3;
+
+    serveBrowserPackage();
+
+    d.dir(appPath, [d.pubspec({
+        "name": "myapp",
+        "dependency_overrides": {
+          "browser": "any"
+        }
+      }),
+          d.dir(
+              'web',
+              [d.file('file.dart', 'void main() => print("hello");')])]).create();
+
+    pubGet();
+
+    schedulePub(
+        args: ["build", "--all"],
+        output: new RegExp(r'Built 3 files to "build".'));
+
+    d.dir(
+        appPath,
+        [
+            d.dir(
+                'build',
+                [
+                    d.dir(
+                        'web',
+                        [
+                            d.dir(
+                                'packages',
+                                [
+                                    d.dir(
+                                        'browser',
+                                        [
+                                            d.file('dart.js', 'contents of dart.js'),
+                                            d.file('interop.js', 'contents of interop.js')])])])])]).validate();
+  });
+}