CQ: Remove one out of two usages of buildbot_json in try_job_on_rietveld.py

commit-queue/verification/try_job_on_rietveld.py

Index: commit-queue/verification/try_job_on_rietveld.py
===================================================================
--- commit-queue/verification/try_job_on_rietveld.py	(revision 238151)
+++ commit-queue/verification/try_job_on_rietveld.py	(working copy)
@@ -667,16 +667,14 @@
         self.try_server_url, job.builder, job.build)
 
   @model.immutable
-  def _update_dashboard(self, pending, job, status):
+  def _update_dashboard(self, pending, job):
     """Updates the CQ dashboard with the current Try Job state as known to the
     CQ.
     """
     logging.debug('_update_dashboard(%s/%s)', job.builder, job.build)
-    build = status.builders[job.builder].builds[job.build]
     info = {
       'build': job.build,
       'builder': job.builder,
-      'duration': build.duration,
       'job_name': 'CQ',
       'result': job.result,
       'revision': job.revision,
@@ -742,7 +740,7 @@
     if handle:
       for updated_key in keys:
         job = jobs.try_jobs[updated_key]
-        self._update_dashboard(pending, job, status)
+        self._update_dashboard(pending, job)
         jobs.signal_as_failed_if_needed(job, self._build_status_url(job), now)
 
     return True