Disabled more reference builds on the Nexus5X due to the TimeoutException error

tools/perf/benchmarks/service_worker.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 collections
 import page_sets
 import re
 
 from core import perf_benchmark
 
@@ skipping 169 matching lines @@
   The page set is a benchmark page that generates many concurrent requests
   handled by a service worker that does respondWith(new Response()). The test
   result is the response times.
   """
   test = _ServiceWorkerMicroBenchmarkMeasurement
   page_set = page_sets.ServiceWorkerMicroBenchmarkPageSet
 
   @classmethod
   def Name(cls):
     return 'service_worker.service_worker_micro_benchmark'
+
+  @classmethod
+  def ShouldDisable(cls, possible_browser):  # http://crbug.com/597656
+      return (possible_browser.browser_type == 'reference' and
+              possible_browser.platform.GetDeviceTypeName() == 'Nexus 5X')