Get rid of all the library tags.

lib/src/runner/reporter/json.dart

 // Copyright (c) 2015, 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 test.runner.reporter.json;
-
 import 'dart:async';
 import 'dart:convert';
 
 import '../../backend/group.dart';
 import '../../backend/live_test.dart';
 import '../../backend/metadata.dart';
 import '../../frontend/expect.dart';
 import '../../utils.dart';
 import '../engine.dart';
 import '../load_suite.dart';
@@ skipping 184 matching lines @@
     _emit("done", {"success": success});
   }
 
   /// Emits an event with the given type and attributes.
   void _emit(String type, Map attributes) {
     attributes["type"] = type;
     attributes["time"] = _stopwatch.elapsed.inMilliseconds;
     print(JSON.encode(attributes));
   }
 }