Disable failing tests on chromeos.

tools/telemetry/telemetry/page/record_wpr_unittest.py

Index: tools/telemetry/telemetry/page/record_wpr_unittest.py
diff --git a/tools/telemetry/telemetry/page/record_wpr_unittest.py b/tools/telemetry/telemetry/page/record_wpr_unittest.py
index 03edc9ff85d708b88306e1eb34d12e71c90a03cf..a434fa9622837dd38f4f3f3a1743a36327237598 100644
--- a/tools/telemetry/telemetry/page/record_wpr_unittest.py
+++ b/tools/telemetry/telemetry/page/record_wpr_unittest.py
@@ -6,6 +6,7 @@ import os
 import sys
 
 from telemetry import benchmark
+from telemetry import decorators
 from telemetry.core import util
 from telemetry.core import wpr_modes
 from telemetry.page import page as page_module
@@ -142,6 +143,7 @@ class RecordWprUnitTests(tab_test_case.TabTestCase):
     self.assertEqual('DidRunActions', record_page_test.page_test.func_calls[1])
     self.assertEqual('ValidatePage', record_page_test.page_test.func_calls[2])
 
+  @decorators.Disabled('chromeos') # crbug.com/404868.
   def testWprRecorderWithPageSet(self):
     flags = []
     mock_page_set = MockPageSet(url=self._url)