[Findit] Modify handlers_util to prepare for the new UI change.

appengine/findit/handlers/swarming_task.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from base_handler import BaseHandler
 from base_handler import Permission
 from handlers import handlers_util
 from waterfall import buildbot
 
 
 class SwarmingTask(BaseHandler):
   PERMISSION_LEVEL = Permission.ANYONE
 
   def HandleGet(self):
     """Get the information about swarming tasks for failed steps."""
     url = self.request.get('url').strip()
     build_keys = buildbot.ParseBuildUrl(url)
 
     if not build_keys:  # pragma: no cover
       return {'data': {}}
 
-    data = handlers_util.GenerateSwarmingTasksData(*build_keys)
+    data = handlers_util.GetSwarmingTaskInfo(*build_keys)
     return {'data': data}
 
   def HandlePost(self):  # pragma: no cover
     return self.HandleGet()