Disabling some flaky FetchAPI layout tests.

TBR=robertma@chromium.org

Bug: 1106861
Change-Id: Idd91371a1d9e6bb4013e3d7b147ecdbe4b6461d2
No-Try: True
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304103
Commit-Queue: Aleks Totic <atotic@chromium.org>
Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Aleks Totic <atotic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789678}

third_party/blink/web_tests/TestExpectations

@@ -7009,3 +7009,15 @@ crbug.com/1094436 http/tests/devtools/overrides/project-added-with-existing-file
 crbug.com/1094436 http/tests/devtools/persistence/automapping-urlencoded-paths.js [ Pass Failure ]
 crbug.com/1094436 http/tests/devtools/sources/debugger-ui/snippet-edit-breakpoint.js [ Pass Timeout ]
 crbug.com/1094436 http/tests/devtools/sources/debugger/navigator-view.js [ Pass Failure Crash ]
+
+# Sheriff 2020-07-17
+crbug.com/1106861 virtual/cors/external/wpt/fetch/api/abort/general.any.serviceworker.html [ Skip ]
+crbug.com/1106861 virtual/omt-worker-fetch/external/wpt/fetch/api/abort/general.any.html [ Skip ]
+crbug.com/1106861 virtual/omt-worker-fetch/external/wpt/fetch/api/abort/general.any.serviceworker.html [ Skip ]
+crbug.com/1106861 external/wpt/fetch/api/abort/general.any.worker.html [ Skip ]
+crbug.com/1106861 virtual/cors/external/wpt/fetch/api/abort/general.any.sharedworker.html [ Skip ]
+crbug.com/1106861 virtual/cors/external/wpt/fetch/api/abort/general.any.worker.html [ Skip ]
+crbug.com/1106861 virtual/omt-worker-fetch/external/wpt/fetch/api/abort/general.any.worker.html [ Skip ]
+crbug.com/1106861 external/wpt/fetch/api/abort/general.any.html [ Skip ]
+crbug.com/1106861 virtual/omt-worker-fetch/external/wpt/fetch/api/abort/general.any.sharedworker.html [ Skip ]
+crbug.com/1106861 external/wpt/fetch/api/abort/general.any.sharedworker.html [ Skip ]