Remove dead code left over from the removal of the
BeforeParserFetchTemplateAndtitle (sic) hook in
20c5632c4e.
While we're at it, add test cases for statelessFetchTemplate and
improve coverage.
Followup-To: Ifecd4108eb02ebccc0c7bc4ec432036da08ffe53
Followup-To: Idf1fd12cc61ca30867dc9f8aeb1701fe035fc5ff
Change-Id: I135f5234e7be015a2781d6cb8d23b3143b618c5a
