[tools/perf] Delete unused variable

tools/perf/measurements/oilpan_gc_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.
 
 import os
 
 from telemetry.page import page_test
 from telemetry.timeline.model import TimelineModel
 from telemetry.timeline import tracing_config
 from telemetry.value import list_of_scalar_values
@@ skipping 117 matching lines @@
     gc_time += sum(values[key])
   results.AddValue(scalar.ScalarValue(page, 'oilpan_gc', unit, gc_time))
 
 
 class _OilpanGCTimesBase(page_test.PageTest):
 
   def __init__(self, action_name=''):
     super(_OilpanGCTimesBase, self).__init__(action_name)
 
   def WillNavigateToPage(self, page, tab):
+    del page  # unused
     # FIXME: Remove webkit.console when blink.console lands in chromium and
     # the ref builds are updated. crbug.com/386847
     config = tracing_config.TracingConfig()
     for c in ['webkit.console', 'blink.console', 'blink_gc']:
       config.tracing_category_filter.AddIncludedCategory(c)
     config.enable_chrome_trace = True
     tab.browser.platform.tracing_controller.StartTracing(config, timeout=1000)
 
   def ValidateAndMeasurePage(self, page, tab, results):
+    del page  # unused
     timeline_data = tab.browser.platform.tracing_controller.StopTracing()
     timeline_model = TimelineModel(timeline_data)
     threads = timeline_model.GetAllThreads()
     for thread in threads:
       if thread.name == _CR_RENDERER_MAIN:
         _AddTracingResults(thread, results)
 
   def DidRunPage(self, platform):
     if platform.tracing_controller.is_tracing_running:
       platform.tracing_controller.StopTracing()
 
 
 class OilpanGCTimesForSmoothness(_OilpanGCTimesBase):
 
   def __init__(self):
     super(OilpanGCTimesForSmoothness, self).__init__()
     self._interaction = None
 
   def DidNavigateToPage(self, page, tab):
+    del page  # unused
     self._interaction = tab.action_runner.CreateInteraction(_RUN_SMOOTH_ACTIONS)
     self._interaction.Begin()
 
   def ValidateAndMeasurePage(self, page, tab, results):
     self._interaction.End()
     super(OilpanGCTimesForSmoothness, self).ValidateAndMeasurePage(
         page, tab, results)
 
 
 class OilpanGCTimesForBlinkPerf(_OilpanGCTimesBase):
@@ skipping 18 matching lines @@
 
   def __init__(self):
     super(OilpanGCTimesForInternals, self).__init__()
 
   @classmethod
   def CustomizeBrowserOptions(cls, options):
     # 'expose-internals-for-testing' can be enabled on content shell.
     assert 'content-shell' in options.browser_type
     options.AppendExtraBrowserArgs(['--expose-internals-for-testing',
                                     '--js-flags=--expose-gc'])