[Linux][Flaky] Disable timeline-receive-response-event

The test seems to leak objects only occasionally, e.g.
(leak detected:
({"numberOfLiveContextLifecycleStateObservers":[2,8],
  "numberOfLiveDocuments":[1,4],
  "numberOfLiveNodes":[4,2204],
  "numberOfLiveResourceFetchers":[1,4]}),
 text diff)

NOTRY=true
TBR=petermarshall@chromium.org

Bug: 1046784
Change-Id: Iba2c7b27242a330ad1307ab6a2ea9c1fcec343e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617839Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841429}

third_party/blink/web_tests/TestExpectations

@@ -5936,5 +5936,9 @@ crbug.com/1161301 [ Mac10.15 ] external/wpt/webxr/xrSession_requestReferenceSpac
 crbug.com/1161352 [ Mac10.14 ] virtual/controls-refresh-hc/fast/forms/color-scheme/search/search-appearance-basic.html [ Pass Timeout ]
 crbug.com/1161352 [ Mac10.14 ] external/wpt/webxr/xrSession_requestReferenceSpace_features.https.html [ Pass Failure Timeout ]
 
+# Failing on Webkit Linux Leak only:
+crbug.com/1046784 virtual/threaded/http/tests/devtools/tracing/timeline-receive-response-event.js [ Pass Failure ]
+crbug.com/1046784 http/tests/devtools/tracing/timeline-receive-response-event.js [ Pass Failure ]
+
 # Sheriff 2021-01-21
 crbug.com/1164166 [ Linux ] virtual/synchronous_html_parser/external/wpt/preload/avoid-prefetching-on-text-plain.html [ Pass Failure ]