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
Also, we tend to try to centralize our imports at the top of the file, so in cases like this it is preferable to import the required page objects at the top, with the rest of the imports, as opposed to in the middle of a page object method. Doing the former makes the page object methods easier to read and understand, and it also makes it easier to see all of the dependencies of the object in one place.

Sometimes we cannot do the import at the top of the page as it could create a circular dependency, but unless that is causing a problem it's better to move the imports to the top of the file.