Don't implicitly run "pub get".

test/dart2js/includes_source_maps_in_debug_test.dart

 // 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.
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   integration("includes source map URLs in a debug build", () {
     d.dir(appPath, [
       d.appPubspec(),
       d.dir("web", [
         d.file("main.dart", "void main() => print('hello');")
       ])
     ]).create();
 
+    pubGet();
     schedulePub(args: ["build", "--mode", "debug"],
         output: new RegExp(r'Built \d+ files to "build".'),
         exitCode: 0);
 
     d.dir(appPath, [
       d.dir('build', [
         d.dir('web', [
           d.matcherFile('main.dart.js',
               contains("# sourceMappingURL=main.dart.js.map")),
           d.matcherFile('main.dart.js.map', contains('"file": "main.dart.js"'))
         ])
       ])
     ]).validate();
   });
 }