Use indentation for maps in lockfile.

sdk/lib/_internal/pub/test/lock_file_test.dart

 // Copyright (c) 2012, 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 lock_file_test;
 
 import 'package:unittest/unittest.dart';
 import 'package:yaml/yaml.dart';
 
 import '../lib/src/lock_file.dart';
@@ skipping 170 matching lines @@
               'description': 'foo desc'
             },
             'bar': {
               'version': '3.2.1',
               'source': 'mock',
               'description': 'bar desc'
             }
           }
         }));
       });
-
-      test('lockfile is alphabetized by package name', () {
-        var testNames = ['baz', 'Qwe', 'Q', 'B', 'Bar', 'bar', 'foo'];
-        testNames.forEach((name) {
-          lockfile.packages[name] = new PackageId(name, mockSource.name,
-            new Version.parse('5.5.5'), '$name desc');
-        });
-
-        expect(lockfile.serialize(),
-          '# Generated by pub\n'
-          '# See http://pub.dartlang.org/doc/glossary.html#lockfile\n'
-          '\n'
-          '{"packages":{'
-          '"B":{"version":"5.5.5","source":"mock","description":"B desc"},'
-          '"Bar":{"version":"5.5.5","source":"mock","description":"Bar desc"},'
-          '"Q":{"version":"5.5.5","source":"mock","description":"Q desc"},'
-          '"Qwe":{"version":"5.5.5","source":"mock","description":"Qwe desc"},'
-          '"bar":{"version":"5.5.5","source":"mock","description":"bar desc"},'
-          '"baz":{"version":"5.5.5","source":"mock","description":"baz desc"},'
-          '"foo":{"version":"5.5.5","source":"mock","description":"foo desc"}}}'
-          '\n'
-        );
-      });
     });
   });
 }