Move multiple-workers/003.html to LeakExpectations

The test looks being timeout only on Leak bot.

TBR=asamidoi@chromium.org

No-Try: true
Bug: 1151861
Change-Id: Iaa48c3f995e710fa236f3894165ad9f1e2165a2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573961
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833630}

third_party/blink/web_tests/LeakExpectations

@@ -37,6 +37,9 @@ crbug.com/1098106 virtual/off-main-thread-css-paint/http/tests/csspaint/invalida
 crbug.com/1098106 virtual/off-main-thread-css-paint/http/tests/csspaint/invalidation-background-image.html [ Crash ]
 crbug.com/1098106 virtual/off-main-thread-css-paint/http/tests/csspaint/invalidation-content-image.html [ Crash ]
 
+# Random timeout
+crbug.com/1151861 [ Linux ] external/wpt/workers/semantics/multiple-workers/003.html [ Timeout Crash ]
+
 # -----------------------------------------------------------------
 # Flakily leaks
 # -----------------------------------------------------------------

third_party/blink/web_tests/TestExpectations

@@ -5932,7 +5932,6 @@ crbug.com/1150518 [ Win ] virtual/gpu/fast/canvas/canvas-composite-shadow.html [
 crbug.com/1150475 fast/dom/open-and-close-by-DOM.html [ Pass Failure ]
 
 #Sheriff 2020-11-23
-crbug.com/1151861 external/wpt/workers/semantics/multiple-workers/003.html [ Timeout Crash ]
 crbug.com/1152088 [ Mac10.13 Debug ] fast/dom/cssTarget-crash.html [ Pass Timeout ]
 crbug.com/1149734 http/tests/devtools/sources/source-frame-toolbar-items.js [ Pass Failure ]
 crbug.com/1149734 http/tests/devtools/sources/debugger-frameworks/frameworks-sourcemap.js [ Pass Failure ]