Bug 1104742 - Marionette runner should cleanup marionette objects when gc'ed, r=AutomatedTester

--HG--
extra : rebase_source : 8a869167794d3bb439d167f4d29ceb8c820a5ebf

testing/marionette/client/marionette/runner/base.py

@@ -942,6 +942,9 @@ setReq.onerror = function() {
         if self.httpd:
             self.httpd.stop()
 
+        if self.marionette:
+            self.marionette.cleanup()
+
     __del__ = cleanup
 
     def generate_xml(self, results_list):