Fix copy_dart to correctly put library comments BEFORE the library directive.

sdk/lib/chrome/dart2js/chrome_dart2js.dart

+/// Native wrappers for the Chrome Packaged App APIs.
+///
+/// These functions allow direct access to the Packaged App APIs, allowing
+/// Chrome Packaged Apps to be written using Dart.
+///
+/// For more information on these APIs, see the
+/// [Chrome APIs Documentation](http://developer.chrome.com/extensions/api_index.html)
 library chrome;
 
 import 'dart:_foreign_helper' show JS;
 import 'dart:_js_helper';
 import 'dart:html_common';
 import 'dart:html';
 
 // Copyright (c) 2013, 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.
 
 // DO NOT EDIT - unless you are editing documentation as per:
 // https://code.google.com/p/dart/wiki/ContributingHTMLDocumentation
 // Auto-generated dart:chrome library.
 
-/// Native wrappers for the Chrome Packaged App APIs.
-///
-/// These functions allow direct access to the Packaged App APIs, allowing
-/// Chrome Packaged Apps to be written using Dart.
-///
-/// For more information on these APIs, see the Chrome.* APIs Documentation:
-///   http://developer.chrome.com/extensions/api_index.html
 
 /* TODO(sashab): Add "show convertDartClosureToJS" once 'show' works. */
 
 
 // Generated files below this line.
 // Copyright (c) 2013, 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.
 
 /**
@@ skipping 1083 matching lines @@
   /// postIntentResponse is an internal method to responds to an intent
   /// previously sent to a packaged app. This is identified by intentId, and
   /// should only be invoked at most once per intentId.
   void postIntentResponse(AppRuntimeIntentResponse intentResponse) => JS('void', '#.postIntentResponse(#)', this._jsObject, convertArgument(intentResponse));
 
   API_app_runtime(this._jsObject) {
     onLaunched = new Event_app_runtime_onLaunched(JS('', '#.onLaunched', this._jsObject));
     onRestarted = new Event_app_runtime_onRestarted(JS('', '#.onRestarted', this._jsObject));
   }
 }