Upgrade to use stable `package:googleapis/v1.dart` of datastore

test/db/e2e/db_test_impl.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.
 
 library db_test;
 
 /// NOTE: In order to run these tests, the following datastore indices must
 /// exist:
 /// $ cat index.yaml
 /// indexes:
@@ skipping 425 matching lines @@
       var usersSortedAndFilteredNameDescNicknameDesc =
           usersSortedNameDescNicknameDesc.where((User u) {
         return LOWER_BOUND.compareTo(u.name) <= 0;
       }).toList();
 
       var fooUsers = users.where(
           (User u) => u.languages.contains('foo')).toList();
       var barUsers = users.where(
           (User u) => u.languages.contains('bar')).toList();
       var usersWithWife = users.where(
-          (User u) => u.wife == root.append(User, id: 42 + 3));
+          (User u) => u.wife == root.append(User, id: 42 + 3)).toList();
 
       var allInserts = []
           ..addAll(users)
           ..addAll(expandoPersons);
       var allKeys = allInserts.map((db.Model model) => model.key).toList();
       return store.commit(inserts: allInserts).then((_) {
         return waitUntilEntitiesReady(store, allKeys, partition).then((_) {
           var tests = [
             // Queries for [Person] return no results, we only have [User]
             // objects.
@@ skipping 226 matching lines @@
   var scopes = datastore_impl.DatastoreImpl.SCOPES;
 
   withAuthClient(scopes, (String project, httpClient) {
     var datastore = new datastore_impl.DatastoreImpl(httpClient, 's~$project');
     return datastore_test.cleanupDB(datastore, null).then((_) {
       return runE2EUnittest(
           () => runTests(new db.DatastoreDB(datastore), null));
     });
   });
 }