Bug 1070731 - [sms] unit test refactoring for new version chai.assert api

test_agent used very old version chai library version=0.5.3
in the current version=1.9.1 deepEqual take prototype into consideration

apps/sms/test/unit/localization_helper_test.js - plain structure
Hmm, did you replace ```assert.throws``` with ```assertChange(node.dataset.l10nDateFormat, forceUpdateMethod());``` too?