DevTools: disable http/tests/devtools/animation/animation-timeline.js

Temporarily disable the DevTools Animation Timeline test in order to
land: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1920984

Bug: 963183
Change-Id: Ia1db914f4e9acccf300788084f132c5d8e53a9eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1993757Reviewed-by: Robert Paveza <Rob.Paveza@microsoft.com>
Commit-Queue: Kalon Hinds <kahinds@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#730003}

third_party/blink/web_tests/TestExpectations

@@ -7238,3 +7238,6 @@ crbug.com/1039401 [ Linux ] virtual/web-components-v0-disabled/fast/dom/HTMLMete
 
 # Sheriff 2020-01-09
 crbug.com/1040270 http/tests/devtools/elements/styles-1/disable-property-workingcopy-update.js [ Pass Timeout ]
+
+# Temporarily disabled to land Animations accessibility changes in DevTools
+crbug.com/963183 http/tests/devtools/animation/animation-timeline.js [ Pass Failure ]