Disable multiple worker-related wpt/referrer-policy tests

These tests are timing out on Webkit Linux Leak. Bunch of similar tests
already have been disabled.

Tbr: hiroshige@chromium.org
Bug: 1068175
Change-Id: Idc4adb0e7a1d6bcba9a970c0662d5577c9554c4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2162728Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Commit-Queue: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#761940}

third_party/blink/web_tests/LeakExpectations

@@ -169,6 +169,16 @@ crbug.com/1071849 [ Linux ] http/tests/devtools/isolated-code-cache/same-origin-
 # Sheriff 2020-04-22
 crbug.com/1071849 [ Linux ] virtual/not-split-http-cache-not-site-per-process/http/tests/devtools/isolated-code-cache/same-origin-module-test.js [ Pass Failure ]
 
+# Sheriff 2020-04-23
+crbug.com/1068175 [ Linux ] virtual/omt-worker-fetch/external/wpt/referrer-policy/gen/worker-module.http-rp/strict-origin/worker-module.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] virtual/omt-worker-fetch/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/same-origin/worker-classic.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-module.http-rp/origin/worker-module.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-module.http-rp/unsafe-url/worker-module.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-classic.http-rp/origin/worker-module.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-classic.http-rp/no-referrer-when-downgrade/worker-module.http.html [ Pass Timeout ]
+crbug.com/1068175 [ Linux ] external/wpt/referrer-policy/gen/worker-classic.http-rp/unset/worker-module.http.html [ Pass Timeout ]
+
 ###########################################################################
 # WARNING: Memory leaks must be fixed asap. Sheriff is expected to revert #
 # culprit CLs instead of suppressing the leaks. If you have any question, #