Don't implicitly run "pub get".

test/build/includes_assets_from_dependencies_test.dart

 // 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.
 
 // 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.file("index.html", "html"),
       ]),
       d.dir("web", [
         d.file("index.html", "html"),
         d.dir("sub", [
           d.file("index.html", "html")
         ])
       ])
     ]).create();
 
+    pubGet();
     schedulePub(args: ["build", "--all"],
         output: new RegExp(r'Built 7 files to "build".'));
 
     d.dir(appPath, [
       d.dir('build', [
         d.dir('example', [
           d.file("index.html", "html"),
           d.dir('packages', [
             d.dir('foo', [
               d.file('foo.txt', 'foo'),
@@ skipping 16 matching lines @@
           d.dir("sub", [
             d.file("index.html", "html"),
             // "packages" should *only* be created in the top-level directory.
             d.nothing("packages")
           ])
         ])
       ])
     ]).validate();
   });
 }