[tools/perf] Delete unused variable

tools/perf/measurements/thread_times.py

 # Copyright 2014 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 telemetry.page import page_test
 from telemetry.timeline import tracing_category_filter
 from telemetry.web_perf.metrics import layout
 
 from measurements import timeline_controller
 from metrics import timeline
@@ skipping 11 matching lines @@
         enable_auto_issuing_record=False)
     if self._report_silk_details:
       # We need the other traces in order to have any details to report.
       self._timeline_controller.trace_categories = None
     else:
       self._timeline_controller.trace_categories = \
           tracing_category_filter.CreateNoOverheadFilter().filter_string
     self._timeline_controller.SetUp(page, tab)
 
   def DidNavigateToPage(self, page, tab):
+    del page  # unused
     self._timeline_controller.Start(tab)
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    del page  # unused
     self._timeline_controller.Stop(tab, results)
     metric = timeline.ThreadTimesTimelineMetric()
     renderer_thread = \
         self._timeline_controller.model.GetRendererThreadFromTabId(tab.id)
     if self._report_silk_details:
       metric.details_to_report = timeline.ReportSilkDetails
     metric.AddResults(self._timeline_controller.model, renderer_thread,
                       self._timeline_controller.smooth_records, results)
     layout_metric = layout.LayoutMetric()
     layout_metric.AddResults(self._timeline_controller.model, renderer_thread,
                              self._timeline_controller.smooth_records, results)
 
   def DidRunPage(self, platform):
     if self._timeline_controller:
       self._timeline_controller.CleanUp(platform)