[perfbot health] Disable v8.browsing_desktop.ref on Mac

tools/perf/benchmarks/v8_browsing.py

 # Copyright 2016 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 re
 
 from core import perf_benchmark
 from telemetry import benchmark
 from telemetry.timeline import chrome_trace_config
 from telemetry.timeline import chrome_trace_category_filter
@@ skipping 68 matching lines @@
   @classmethod
   def ShouldTearDownStateAfterEachStoryRun(cls):
     return True
 
 
 class V8DesktopBrowsingBenchmark(_V8BrowsingBenchmark):
   PLATFORM = 'desktop'
 
   @classmethod
   def ShouldDisable(cls, possible_browser):
+    # http://crbug.com/628736
+    if (possible_browser.platform.GetOSName() == 'mac' and
+        possible_browser.browser_type == 'reference'):
+      return True
+
     return possible_browser.platform.GetDeviceTypeName() != 'Desktop'
 
-
 @benchmark.Disabled('reference')  # http://crbug.com/628631
 class V8MobileBrowsingBenchmark(_V8BrowsingBenchmark):
   PLATFORM = 'mobile'
 
   @classmethod
   def ShouldDisable(cls, possible_browser):
     return possible_browser.platform.GetDeviceTypeName() == 'Desktop'