[Sheriff] Remove unneeded baseline file after wpt import.

Started happning on Win7 tests after
https://chromium-review.googlesource.com/c/chromium/src/+/2067307.

Bug: None
Change-Id: I9a8414e3e2914fdea20671cda2bcf788c2722bb9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066762Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743508}

third_party/blink/web_tests/platform/win7/external/wpt/storage-access-api/requestStorageAccess.sub.window-expected.txt

-This is a testharness.js-based test.
-PASS [top-level-context] document.requestStorageAccess() should be supported on the document interface
-PASS [top-level-context] document.requestStorageAccess() should be rejected by default with no user gesture
-PASS [top-level-context] document.requestStorageAccess() should be resolved when called properly with a user gesture
-PASS [same-origin-frame] document.requestStorageAccess() should be supported on the document interface
-PASS [same-origin-frame] document.requestStorageAccess() should be rejected by default with no user gesture
-PASS [nested-same-origin-frame] document.requestStorageAccess() should be supported on the document interface
-FAIL [nested-same-origin-frame] document.requestStorageAccess() should be rejected by default with no user gesture assert_unreached: Should have rejected: document.requestStorageAccess() call without user gesture Reached unreachable code
-PASS [cross-origin-frame] document.requestStorageAccess() should be supported on the document interface
-PASS [cross-origin-frame] document.requestStorageAccess() should be rejected by default with no user gesture
-PASS [nested-cross-origin-frame] document.requestStorageAccess() should be supported on the document interface
-PASS [nested-cross-origin-frame] document.requestStorageAccess() should be rejected by default with no user gesture
-Harness: the test ran to completion.
-