Get rid of all the library tags.

lib/src/runner/browser/dartium.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.browser.dartium;
-
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:async/async.dart';
 import 'package:path/path.dart' as p;
 
 import '../../util/io.dart';
 import '../../utils.dart';
 import 'browser.dart';
@@ skipping 226 matching lines @@
         // incorrect WebSocket that already closed.
         return null;
       }
     }).catchError((error, stackTrace) {
       if (!completer.isCompleted) completer.completeError(error, stackTrace);
     });
 
     return completer.operation;
   }
 }