Disable failing media unittests on chromeos.

telemetry/telemetry/internal/actions/load_media_unittest.py

Index: telemetry/telemetry/internal/actions/load_media_unittest.py
diff --git a/telemetry/telemetry/internal/actions/load_media_unittest.py b/telemetry/telemetry/internal/actions/load_media_unittest.py
index 95347afebe58a4820450cc2e78d338f4ceafa7ad..6279b63084aa9f4f52b75b05f026d9a08bdd3396 100644
--- a/telemetry/telemetry/internal/actions/load_media_unittest.py
+++ b/telemetry/telemetry/internal/actions/load_media_unittest.py
@@ -20,8 +20,7 @@ class LoadMediaActionTest(tab_test_case.TabTestCase):
         'window.__hasEventCompleted({{ selector }}, {{ event }});',
         selector=selector, event=event)
 
-  @decorators.Disabled('linux',     # crbug.com/418577
-                       'chromeos')  # crbug.com/632802
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testAwaitedEventIsConfigurable(self):
     """It's possible to wait for different events."""
     action = LoadMediaAction(selector='#video_1', timeout_in_seconds=0.1,
@@ -30,7 +29,7 @@ class LoadMediaActionTest(tab_test_case.TabTestCase):
     action.RunAction(self._tab)
     self.assertTrue(self.eventFired('#video_1', 'loadedmetadata'))
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testLoadWithNoSelector(self):
     """With no selector the first media element is loaded."""
     action = LoadMediaAction(timeout_in_seconds=5)
@@ -39,7 +38,7 @@ class LoadMediaActionTest(tab_test_case.TabTestCase):
     self.assertTrue(self.eventFired('#video_1', 'canplaythrough'))
     self.assertFalse(self.eventFired('#audio_1', 'canplaythrough'))
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testLoadWithSelector(self):
     """Only the element matching the selector is loaded."""
     action = LoadMediaAction(selector='#audio_1', timeout_in_seconds=5)
@@ -48,7 +47,7 @@ class LoadMediaActionTest(tab_test_case.TabTestCase):
     self.assertFalse(self.eventFired('#video_1', 'canplaythrough'))
     self.assertTrue(self.eventFired('#audio_1', 'canplaythrough'))
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testLoadWithAllSelector(self):
     """Both elements are loaded with selector='all'."""
     action = LoadMediaAction(selector='all', timeout_in_seconds=5)
@@ -57,7 +56,7 @@ class LoadMediaActionTest(tab_test_case.TabTestCase):
     self.assertTrue(self.eventFired('#video_1', 'canplaythrough'))
     self.assertTrue(self.eventFired('#audio_1', 'canplaythrough'))
 
-  @decorators.Disabled('linux')  # crbug.com/418577
+  @decorators.Disabled('linux', 'chromeos')  # crbug.com/749890
   def testLoadRaisesAnExceptionOnTimeout(self):
     """The load action times out if the event does not fire."""
     action = LoadMediaAction(selector='#video_1', timeout_in_seconds=0.1,