Update dart:chrome to include fileSystem, and update summary docs.

tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate

Index: tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate
diff --git a/tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate b/tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate
index 3798c9c26028c3811b7b7f872559e1319a253584..2ea934d250fff0a77d94ee04638226ffb548157e 100644
--- a/tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate
+++ b/tools/dom/templates/html/dart2js/chrome_dart2js.darttemplate
@@ -6,13 +6,13 @@
 // DO NOT EDIT
 // Auto-generated dart:chrome library.
 
-/// Native wrappers for the Chrome Packaged App APIs.
+/// 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.
+/// These functions allow direct access to the chrome.* 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
+/// For more information on these APIs, see the
+/// [chrome.* API documentation](http://developer.chrome.com/apps/api_index.html).
 library chrome;
 
 import 'dart:_foreign_helper' show JS;