Fix stack symbolization in Telemetry on Windows.

tools/perf/core/stacktrace_unittest.py

 # Copyright 2015 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.
 
 from telemetry.core import exceptions
 from telemetry import decorators
 from telemetry.testing import tab_test_case
 
 
 class TabStackTraceTest(tab_test_case.TabTestCase):
 
-  # TODO(dyen): For now this works on a mac & linux but continue to expand this.
+  # TODO(dyen): For now this doesn't work on Android but continue to
+  # expand this.
+  # TODO(kbr): this test doesn't work on the Windows Swarming bots
+  # yet. http://crbug.com/561763
   @decorators.Enabled('mac', 'linux')
   # Stack traces do not currently work on 10.6, but they are also being
   # disabled shortly so just disable it for now.
   @decorators.Disabled('snowleopard')
   def testStackTrace(self):
     try:
       self._tab.Navigate('chrome://crash', timeout=5)
     except exceptions.DevtoolsTargetCrashException as e:
       self.assertIn('Thread 0 (crashed)', '\n'.join(e.stack_trace))
 
-  # Currently stack traces do not work on windows: http://crbug.com/476110
-  # Linux stack traces depends on fission support: http://crbug.com/405623
+  # Stack traces aren't working on Android yet.
+  # TODO(kbr): this test doesn't work on the Windows Swarming bots
+  # yet. http://crbug.com/561763
   @decorators.Enabled('mac', 'linux')
   @decorators.Disabled('snowleopard')
   def testCrashSymbols(self):
     try:
       self._tab.Navigate('chrome://crash', timeout=5)
     except exceptions.DevtoolsTargetCrashException as e:
       self.assertIn('CrashIntentionally', '\n'.join(e.stack_trace))