[Sheriff] Disable flaky worker-related tests

Multiple flakes on Webkit Linux Leak (e.g. https://ci.chromium.org/p/chromium/builders/ci/WebKit%20Linux%20Leak/16692)

TBR=hiroshige@chromium.org

Bug: 1068175
Change-Id: Iee830b5b4c604ff4cf0527643447f389d3674a1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300231Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788749}

third_party/blink/web_tests/LeakExpectations

@@ -167,6 +167,18 @@ crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-module.http-
 crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-classic.http-rp/same-origin/worker-module.http.html [ Pass Timeout ]
 crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-classic.http-rp/origin-when-cross-origin/worker-classic.http.html [ Pass Timeout ]
 
+# Sheriff 2020-07-15
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-classic.http-rp/origin-when-cross-origin/worker-module.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-classic.http-rp/no-referrer/worker-classic.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-classic.http-rp/no-referrer-when-downgrade/worker-classic.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-classic.http-rp/unsafe-url/worker-classic.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-module.http-rp/unset/worker-classic.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] virtual/cors/external/wpt/referrer-policy/gen/worker-classic.http-rp/no-referrer-when-downgrade/worker-classic.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] virtual/cors/external/wpt/referrer-policy/gen/worker-classic.http-rp/same-origin/worker-classic.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] virtual/cors/external/wpt/referrer-policy/gen/worker-classic.http-rp/strict-origin-when-cross-origin/worker-classic.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] virtual/cors/external/wpt/referrer-policy/gen/worker-classic.http-rp/unsafe-url/worker-classic.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] virtual/cors/external/wpt/referrer-policy/gen/worker-classic.http-rp/unset/worker-classic.http.html [ Pass Timeout ]
+
 # This test triggers existing leaky behavior, but this test also catches
 # a prior crash.
 crbug.com/1103082 [ Linux ] fast/forms/select/select-change-layout-object-crash.html [ Failure ]