Disable test virtual/threaded/http/tests/devtools/tracing/timeline-misc/timeline-load-event.js

Disable the test as it's flaky a lot on WebKit Linux Leak.

Bug: 1067650
Tbr: jarhar@chromium.org
Change-Id: I7e97202eda9b35669151426530fea9accf33b704
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134775
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756336}

third_party/blink/web_tests/LeakExpectations

@@ -118,6 +118,9 @@ crbug.com/1029417 [ Linux ] external/wpt/web-nfc/NDEFReader_scan_filter.https.ht
 # Sheriff 2019-12-30
 crbug.com/1038388 [ Linux ] http/tests/devtools/tracing/timeline-time/timeline-time.js [ Pass Failure ]
 
+# Sheriff 2020-04-03
+crbug.com/1067650 [ Linux ] virtual/threaded/http/tests/devtools/tracing/timeline-misc/timeline-load-event.js [ Pass Failure ]
+
 ###########################################################################
 # WARNING: Memory leaks must be fixed asap. Sheriff is expected to revert #
 # culprit CLs instead of suppressing the leaks. If you have any question, #