Mark require-corp.https.html layout test as flaky

TBR=yhirano

Bug: 1013523
Change-Id: Iad71979f640ed5ae42c7fe00982da2876935fb95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855978Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705065}

third_party/blink/web_tests/TestExpectations

@@ -5789,3 +5789,5 @@ crbug.com/1013391 http/tests/devtools/a11y-axe-core/basic-a11y-test.js [ Timeout
 crbug.com/1013391 http/tests/devtools/a11y-axe-core/performance/landing-page-a11y-test.js [ Timeout ]
 crbug.com/1013391 http/tests/devtools/a11y-axe-core/performance/performance-pane-a11y-test.js [ Timeout ]
 crbug.com/1013391 http/tests/devtools/a11y-axe-core/settings/shortcuts-a11y-test.js [ Timeout ]
+crbug.com/1013523 [ Release ] virtual/cross-origin-embedder-policy/external/wpt/html/cross-origin-embedder-policy/require-corp.https.html [ Failure Pass ]
+crbug.com/1013523 [ Release Linux Mac ] external/wpt/html/cross-origin-embedder-policy/require-corp.https.html [ Failure Pass ]