Don't implicitly run "pub get".

test/dart2js/compiles_entrypoints_in_root_package_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.
 
 // Dart2js can take a long time to compile dart code, so we increase the timeout
 // to cope with that.
 @Timeout.factor(3)
 
 import 'package:scheduled_test/scheduled_test.dart';
 
@@ skipping 20 matching lines @@
       ]),
       d.dir('web', [
         d.file('file.dart', 'void main() => print("hello");'),
         d.file('lib.dart', 'void foo() => print("hello");'),
         d.dir('subdir', [
           d.file('subfile.dart', 'void main() => print("ping");')
         ])
       ])
     ]).create();
 
+    pubGet();
     schedulePub(args: ["build", "benchmark", "foo", "web"],
         output: new RegExp(r'Built 6 files to "build".'));
 
     d.dir(appPath, [
       d.dir('build', [
         d.dir('benchmark', [
           d.matcherFile('file.dart.js', isNot(isEmpty)),
           d.nothing('file.dart'),
           d.nothing('lib.dart'),
           d.dir('subdir', [
@@ skipping 16 matching lines @@
           d.nothing('lib.dart'),
           d.dir('subdir', [
             d.matcherFile('subfile.dart.js', isNot(isEmpty)),
             d.nothing('subfile.dart')
           ])
         ])
       ])
     ]).validate();
   });
 }