Bug 1032749 - [testing] Test that an Existing User can Delete Profile

Added test works fine on merging pull for updating css selectors. https://github.com/mozilla/oneanddone/pull/153
Thanks for removing the asserts. We also don't really need all of these comments, as we're just doing what we did above, which is also commented. Perhaps just a single comment here like `Navigate back to the delete profile screen`.