[Sheriff] Remove redundant entries from TestExpectations

Now lint_test_expectations.py is happy.

NOTRY=True
TBR=lanwei@chromium.org

Bug: None
Change-Id: I8a943dcabf9cc4b69d940595fad1caa32e3e154d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485437Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818524}

third_party/blink/web_tests/TestExpectations

@@ -6416,10 +6416,6 @@ crbug.com/1042877 external/wpt/mixed-content/imageset.https.sub.html [ Failure ]
 crbug.com/1042877 external/wpt/upgrade-insecure-requests/gen/iframe-blank-inherit.meta/unset/img-tag.https.html [ Failure ]
 crbug.com/1042877 external/wpt/upgrade-insecure-requests/gen/srcdoc-inherit.meta/unset/img-tag.https.html [ Failure ]
 crbug.com/1042877 external/wpt/upgrade-insecure-requests/gen/top.meta/unset/img-tag.https.html [ Failure ]
-crbug.com/1042877 virtual/omt-worker-fetch/external/wpt/fetch/cross-origin-resource-policy/scheme-restriction.https.window.html [ Failure ]
-crbug.com/1042877 virtual/omt-worker-fetch/external/wpt/upgrade-insecure-requests/gen/iframe-blank-inherit.meta/unset/img-tag.https.html [ Failure ]
-crbug.com/1042877 virtual/omt-worker-fetch/external/wpt/upgrade-insecure-requests/gen/srcdoc-inherit.meta/unset/img-tag.https.html [ Failure ]
-crbug.com/1042877 virtual/omt-worker-fetch/external/wpt/upgrade-insecure-requests/gen/top.meta/unset/img-tag.https.html [ Failure ]
 crbug.com/1042877 http/tests/security/mixedContent/insecure-css-image-with-reload.html [ Failure ]
 crbug.com/1042877 http/tests/security/mixedContent/insecure-image-in-iframe.html [ Failure ]
 crbug.com/1042877 http/tests/security/mixedContent/insecure-image-in-main-frame-allowed.html [ Failure ]