Disable flaky...

Disable flaky external/wpt/webvtt/rendering/cues-with-video/processing-model/dom_override_remove_cue_while_paused.html

TBR=mlamouri@google.com

Bug: 1084378
Change-Id: I9846988c3f3c065dc89962552ea11b6d621fb30b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377661Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Auto-Submit: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801969}

third_party/blink/web_tests/TestExpectations

@@ -5254,6 +5254,9 @@ crbug.com/910979 http/tests/html/validation-bubble-oopif-clip.html [ Failure Pas
 # Recently became flaky on multiple platforms (Linux and Windows primarily)
 crbug.com/927769 fast/webgl/OffscreenCanvas-webgl-preserveDrawingBuffer.html [ Skip ]
 
+# Flaky test.
+crbug.com/1084378 external/wpt/webvtt/rendering/cues-with-video/processing-model/dom_override_remove_cue_while_paused.html [ Pass Failure ]
+
 # Flay probably due to outstanding work for FeaturePolicyForSandbox.
 
 # Sheriff 2019-02-12