sheriff: Disable external/wpt/dom/idlharness.any.serviceworker.html on Linux MSAN.

Tbr: kyleju@chromium.org
Bug: 856601
Change-Id: I971d50f4f6629d3496e5c70d8ceaf7e1b00543a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1772207Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690964}

third_party/blink/web_tests/MSANExpectations

@@ -335,5 +335,6 @@ crbug.com/856601 [ Linux ] webaudio/Analyser/realtimeanalyser-freq-data.html [ P
 crbug.com/856601 [ Linux ] external/wpt/secure-contexts/idlharness.any.serviceworker.html [ Pass Timeout ]
 crbug.com/993953 [ Linux ] http/tests/devtools/wasm-isolated-code-cache/wasm-cache-test.js [ Pass Timeout ]
 crbug.com/993953 [ Linux ] virtual/wasm-site-isolated-code-cache/http/tests/devtools/wasm-isolated-code-cache/wasm-cache-test.js [ Pass Timeout ]
+crbug.com/856601 [ Linux ] external/wpt/dom/idlharness.any.serviceworker.html [ Pass Timeout ]
 
 # Note to sheriffs: Timeouts about "idlharness" or "interfaces" are usually crbug.com/856601.