Get rid of all the library tags.

lib/src/runner/browser/browser.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.browser;
-
 import 'dart:async';
 import 'dart:io';
 
 import 'package:stack_trace/stack_trace.dart';
 
 import '../../utils.dart';
 import '../application_exception.dart';
 
 typedef Future<Process> StartBrowserFn();
 
@@ skipping 95 matching lines @@
   /// Returns the same [Future] as [onExit], except that it won't emit
   /// exceptions.
   Future close() {
     _closed = true;
     _process.then((process) => process.kill());
 
     // Swallow exceptions. The user should explicitly use [onExit] for these.
     return onExit.catchError((_) {});
   }
 }