move find cron for branch to correct query

lib/travis/api/v3/queries/cron.rb

@@ -8,5 +8,9 @@ module Travis::API::V3
       return Models::Cron.find_by_id(id) if id
       raise WrongParams, 'missing cron.id'.freeze
     end
+
+    def find_for_branch(branch)
+      branch.cron
+    end
   end
 end

lib/travis/api/v3/queries/crons.rb

@@ -1,10 +1,6 @@
 module Travis::API::V3
   class Queries::Crons < Query
 
-    def find(branch)
-      branch.cron
-    end
-
     def start(branch)
       raise ServerError, 'repository does not have a github_id'.freeze unless branch.repository.github_id
 

lib/travis/api/v3/services/cron/for_branch.rb

@@ -2,7 +2,7 @@ module Travis::API::V3
   class Services::Cron::ForBranch < Service
 
     def run!
-      Models::Cron.where(:branch_id => find(:branch, find(:repository))).first
+      query.find_for_branch(find(:branch, find(:repository)))
     end
   end
 end