Remove obsolete --running-performance-benchmark flag.

tools/perf/measurements/smoothness.py

 # Copyright 2013 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 legacy_page_test
 from telemetry.timeline import chrome_trace_category_filter
 from telemetry.web_perf import timeline_based_measurement
 from telemetry.web_perf.metrics import smoothness
 
 
@@ skipping 21 matching lines @@
 
   def __init__(self, needs_browser_restart_after_each_page=False):
     super(Smoothness, self).__init__(needs_browser_restart_after_each_page)
     self._results_wrapper = _CustomResultsWrapper()
     self._tbm = None
 
   @classmethod
   def CustomizeBrowserOptions(cls, options):
     options.AppendExtraBrowserArgs('--enable-gpu-benchmarking')
     options.AppendExtraBrowserArgs('--touch-events=enabled')
-    options.AppendExtraBrowserArgs('--running-performance-benchmark')
 
   def WillNavigateToPage(self, page, tab):
     # FIXME: Remove webkit.console when blink.console lands in chromium and
     # the ref builds are updated. crbug.com/386847
     custom_categories = [
         'webkit.console', 'blink.console', 'benchmark', 'trace_event_overhead']
     category_filter = chrome_trace_category_filter.ChromeTraceCategoryFilter(
         ','.join(custom_categories))
 
     options = timeline_based_measurement.Options(category_filter)
@@ skipping 21 matching lines @@
         '--enable-threaded-compositing',
         '--enable-gpu-benchmarking'
     ])
 
 
 class SmoothnessWithRestart(Smoothness):
 
   def __init__(self):
     super(SmoothnessWithRestart, self).__init__(
         needs_browser_restart_after_each_page=True)