Remove the "pkgbuild" step on the bots.

tools/gardening/lib/src/buildbot_data.dart

 // Copyright (c) 2017, 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 'buildbot_structures.dart';
 
 /// Data describing the steps of the buildbots.
 const List<BuildGroup> buildGroups = const <BuildGroup>[
   const BuildGroup(
     groupName: 'vm',
@@ skipping 702 matching lines @@
       const BuildSubgroup(shardNames: const <String>[
         'pub-linux-be',
       ], testSteps: const <String>[
         'annotated_steps',
       ]),
       const BuildSubgroup(shardNames: const <String>[
         'pkg-mac10.11-release-be',
       ], testSteps: const <String>[
         'package unit tests',
         'third_party/pkg_tested unit tests',
-        'pub get dependencies',
       ]),
       const BuildSubgroup(shardNames: const <String>[
         'pkg-linux-release-be',
       ], testSteps: const <String>[
         'package unit tests',
         'third_party/pkg_tested unit tests',
-        'pub get dependencies',
       ]),
       const BuildSubgroup(shardNames: const <String>[
         'pkg-win7-release-be',
       ], testSteps: const <String>[
         'package unit tests',
         'third_party/pkg_tested unit tests',
-        'pub get dependencies',
       ]),
     ],
   ),
   const BuildGroup(
     groupName: 'dartium-full',
     subgroups: const <BuildSubgroup>[
       const BuildSubgroup(shardNames: const <String>[
         'dartium-linux-x64-be',
       ], testSteps: const <String>[
         'annotated steps',
@@ skipping 108 matching lines @@
   }
 
   List<BuildUri> createShardUris(String shardName, int buildNumber) {
     List<BuildUri> uriList = <BuildUri>[];
     for (String testStep in testSteps) {
       uriList.add(new BuildUri.fromData(shardName, buildNumber, testStep));
     }
     return uriList;
   }
 }