[Telemetry] Last CL of making enable/disable annotation match old master.cfg.

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
 
+
 class V8GarbageCollectionCases(benchmark.Benchmark):
   """Measure V8 metrics on the garbage collection cases."""
   test = timeline_based_measurement.TimelineBasedMeasurement
   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')