telemetry: Remove command line args from page test

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 page_sets
 from telemetry.web_perf import timeline_based_measurement
 from telemetry import benchmark
 
 
 @benchmark.Disabled  # crbug.com/416502
 class V8GarbageCollectionCases(benchmark.Benchmark):
   """Measure V8 metrics on the garbage collection cases."""
-  test = timeline_based_measurement.TimelineBasedMeasurement
+  def CreatePageTest(self, options):
+    # TODO(ernstm): Remove v8-overhead when benchmark relevant v8 events become
+    # available in the 'benchmark' category.
+    return timeline_based_measurement.TimelineBasedMeasurement(
+        overhead_level='v8-overhead')
+
   page_set = page_sets.GarbageCollectionCasesPageSet
-
-  # TODO(ernstm): Remove this argument when benchmark relevant v8 events become
-  # available in the 'benchmark' category.
-  @classmethod
-  def SetArgumentDefaults(cls, parser):
-    parser.set_defaults(overhead_level='v8-overhead')