Don't implicitly run "pub get".

test/build/copies_non_dart_files_to_build_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.
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   integration("copies non-Dart files to build/", () {
     servePackages((builder) => builder.serve("browser", "1.0.0"));
 
     d.dir(appPath, [
       // A browser dependency with no entrypoints shouldn't cause dart.js to be
       // copied in.
       d.appPubspec({"browser": "1.0.0"}),
       d.dir('web', [
         d.file('file.txt', 'contents'),
         d.dir('subdir', [
           d.file('subfile.txt', 'subcontents')
         ])
       ])
     ]).create();
 
+    pubGet();
     schedulePub(args: ["build"],
         output: new RegExp(r'Built 2 files to "build".'));
 
     d.dir(appPath, [
       d.dir('build', [
         d.dir('web', [
           d.nothing('packages'),
           d.file('file.txt', 'contents'),
           d.dir('subdir', [
             d.file('subfile.txt', 'subcontents')
           ])
         ])
       ])
     ]).validate();
   });
 }