Mark sensor/ambient-light-sensor.html as flaky on all platforms

BUG=680043
TBR=mikhail.pozdnyakov@intel.com

Review-Url: https://codereview.chromium.org/2622183003 .
Cr-Commit-Position: refs/heads/master@{#442833}

third_party/WebKit/LayoutTests/TestExpectations

@@ -2382,3 +2382,5 @@ crbug.com/588060 editing/unsupported-content/table-delete-003.html [ NeedsRebase
 crbug.com/588060 fast/text/delete-hard-break-character.html [ NeedsRebaseline ]
 crbug.com/588060 paint/invalidation/inline-outline-repaint.html [ NeedsRebaseline ]
 crbug.com/588060 virtual/stable/paint/invalidation/inline-outline-repaint.html [ NeedsRebaseline ]
+
+crbug.com/680043 sensor/ambient-light-sensor.html [ Pass Failure ]