[Sheriff] Update crashy test...

[Sheriff] Update crashy test virtual/enable_wasm/external/wpt/wasm/wasm_indexeddb_test.https.html on MSAN

Tbr: tmartino@chromium.org
No-Try: True

Bug: 842262
Change-Id: I92323428b9a035d7789711038454a97d6c8b90ad
Reviewed-on: https://chromium-review.googlesource.com/1055847Reviewed-by: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557982}

third_party/WebKit/LayoutTests/MSANExpectations

@@ -109,3 +109,6 @@ crbug.com/838057 [ Linux ] virtual/outofblink-cors/external/wpt/fetch/api/cors/c
 crbug.com/838057 [ Linux ] virtual/outofblink-cors/external/wpt/fetch/api/cors/cors-redirect-preflight.any.worker.html [ Crash ]
 crbug.com/838057 [ Linux ] virtual/outofblink-cors/external/wpt/service-workers/service-worker/fetch-canvas-tainting-video-cache.https.html [ Crash ]
 crbug.com/838057 [ Linux ] virtual/outofblink-cors/external/wpt/service-workers/service-worker/fetch-canvas-tainting-video.https.html [ Crash ]
+
+# Crashes on Linux Trusty MSAN
+crbug.com/842262 [ Linux ] virtual/enable_wasm/external/wpt/wasm/wasm_indexeddb_test.https.html [ Crash ]