[Sheriff] Disable flaky http/tests/devtools/elements/highlight/highlight-dom-updates.js

TBR=chenwilliam

Bug: 1042688
Change-Id: I64c7d9366907ee3fc41d75ba18509f4fe57c871e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003176
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732799}

third_party/blink/web_tests/TestExpectations

@@ -6374,3 +6374,4 @@ crbug.com/1042681 external/wpt/html/cross-origin-embedder-policy/blob.https.html
 crbug.com/1042694 fast/forms/form-control-with-state-eager-tracing-crashTest.html [ Pass Timeout ]
 crbug.com/1042689 [ Linux ] http/tests/devtools/coverage/gutter-css.js [ Pass Timeout ]
 crbug.com/1042689 [ Win ] http/tests/devtools/coverage/gutter-css.js [ Pass Timeout ]
+crbug.com/1042688 http/tests/devtools/elements/highlight/highlight-dom-updates.js [ Pass Timeout ]