test_storage.dart fails on chrome.storage.local.set_get

[adam-singer]

14
ERROR
chrome.storage.local.set_get. Test failed: Caught The null object does not have a method '[]'. NoSuchMethodError : method not found: '[]' Receiver: null Arguments: ["foo"]
dart:core                                                                                                                    Object.noSuchMethod
chrome-extension://dkcoaocmommednefibaopcmobfekilmn/src/test_storage.dart 31:26                                              main.<fn>.<fn>.<fn>
dart:async                                                                                                                   _createTimer.<fn>
file:///Volumes/data/b/build/slave/dartium-mac-full-trunk/build/src/dart/tools/dom/src/native_DOMImplementation.dart 255:17  _Timer._Timer.<fn>

[devoncarew]

Fixed in #100.