Get rid of all the library tags.

lib/src/runner/browser/content_shell.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.content_shell;
-
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import '../../util/io.dart';
 import '../../utils.dart';
 import '../application_exception.dart';
 import 'browser.dart';
 
 final _observatoryRegExp = new RegExp(r"^Observatory listening on ([^ ]+)");
@@ skipping 100 matching lines @@
   }
 
   ContentShell._(Future<Process> startBrowser(), this.observatoryUrl,
           this.remoteDebuggerUrl)
       : super(startBrowser);
 
   /// Return the default executable for the current operating system.
   static String _defaultExecutable() =>
       Platform.isWindows ? "content_shell.exe" : "content_shell";
 }