sheriff: disable TabStackTraceTest.testValidDump

TBR=brucedawson@chromium.org

Bug: 804452
Change-Id: I49e348b382ea3df249788b0d26c77b7b9f6afd45
Reviewed-on: https://chromium-review.googlesource.com/881241Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531300}

tools/perf/core/stacktrace_unittest.py

@@ -15,7 +15,8 @@ class TabStackTraceTest(tab_test_case.TabTestCase):
   # Stack traces do not currently work on 10.6, but they are also being
   # disabled shortly so just disable it for now.
   # All platforms except chromeos should at least have a valid minidump.
-  @decorators.Disabled('snowleopard', 'chromeos')
+  # Disabled on win due to crbug.com/804452.
+  @decorators.Disabled('snowleopard', 'chromeos', 'win')
   def testValidDump(self):
     with self.assertRaises(exceptions.DevtoolsTargetCrashException) as c:
       self._tab.Navigate('chrome://crash', timeout=5)