[telemetry] Don't include "" in the --js-flag args used in v8 benchmarks

tools/perf/benchmarks/v8.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
 import shlex
 
 from core import path_util
 from core import perf_benchmark
 from page_sets import google_pages
 
@@ skipping 63 matching lines @@
       if extra_arg.startswith('--js-flags='):
         existing_js_flags.extend(shlex.split(extra_arg[len('--js-flags='):]))
     options.AppendExtraBrowserArgs([
         # TODO(perezju): Temporary workaround to disable periodic memory dumps.
         # See: http://crbug.com/513692
         '--enable-memory-benchmarking',
         # Disable push notifications for Facebook.
         '--disable-notifications',
         # This overrides any existing --js-flags, hence we have to include the
         # previous flags as well.
-        '--js-flags="--heap-growing-percent=10 %s"' %
+        '--js-flags=--heap-growing-percent=10 %s' %
           (' '.join(existing_js_flags))
     ])
 
   def CreateTimelineBasedMeasurementOptions(self):
     v8_categories = [
         'blink.console', 'renderer.scheduler', 'v8', 'webkit.console']
     smoothness_categories = [
         'webkit.console', 'blink.console', 'benchmark', 'trace_event_overhead']
     categories = list(set(v8_categories + smoothness_categories))
     memory_categories = 'blink.console,disabled-by-default-memory-infra'
@@ skipping 52 matching lines @@
   page_set = page_sets.TodoMVCPageSet
 
   def SetExtraBrowserOptions(self, options):
     existing_js_flags = []
     for extra_arg in options.extra_browser_args:
       if extra_arg.startswith('--js-flags='):
         existing_js_flags.extend(shlex.split(extra_arg[len('--js-flags='):]))
     options.AppendExtraBrowserArgs([
         # This overrides any existing --js-flags, hence we have to include the
         # previous flags as well.
-        '--js-flags="--ignition %s"' % (' '.join(existing_js_flags))
+        '--js-flags=--ignition %s' % (' '.join(existing_js_flags))
     ])
 
   def CreateTimelineBasedMeasurementOptions(self):
     category_filter = tracing_category_filter.CreateMinimalOverheadFilter()
     category_filter.AddIncludedCategory('v8')
     category_filter.AddIncludedCategory('blink.console')
     options = timeline_based_measurement.Options(category_filter)
     options.SetLegacyTimelineBasedMetrics([v8_execution.V8ExecutionMetric()])
     return options
 
@@ skipping 58 matching lines @@
     story_set.AddStory(google_pages.AdwordCampaignDesktopPage(story_set))
     return story_set
 
   @classmethod
   def Name(cls):
     return 'v8.google'
 
   @classmethod
   def ShouldTearDownStateAfterEachStoryRun(cls):
     return True