Flaky web_components_test failures

[DanielRyanSmith]

We're occasionally getting flakes in the CI for web_components_test.

chrome 138               ✓ components/test/wpt-app.html » <wpt-app> » WPTApp.prototype.* » computeResultsTotalsRangeMessage » single
chrome 138               ✓ components/test/wpt-app.html » <wpt-app> » WPTApp.prototype.* » computeResultsTotalsRangeMessage » some sum
chrome 138               ✓ components/test/wpt-app.html » <wpt-app> » WPTApp.prototype.* » computePathIsRootDir  » root dir
chrome 138               ✓ components/test/wpt-app.html » <wpt-app> » WPTApp.prototype.* » computePathIsRootDir  » not root dir
chrome 138               ✓ components/test/wpt-app.html » <wpt-app> » WPTApp.prototype.* » wpt-results » testRuns from child wpt-results propagates to wpt-app testRuns
chrome 138               CALL title()
chrome 138               GET /session/:sessionID/title
chrome 138               RESPONSE title()
chrome 138               Tests failed: Error thrown outside of test function: Failed to read a named property 'WCT' from 'Window': Blocked a frame with origin "http://localhost:8081" from accessing a cross-origin frame.
  <unknown> at /components/wct-browser-legacy/browser.js:615
chrome 138               CALL quit()
chrome 138               DELETE /session/:sessionID
chrome 138               RESPONSE quit()
chrome 138               BrowserRunner complete
Test run ended in failure: Error thrown outside of test function: Failed to read a named property 'WCT' from 'Window': Blocked a frame with origin "http://localhost:8081" from accessing a cross-origin frame.
  <unknown> at /components/wct-browser-legacy/browser.js:615

chrome 138 (556/0/0 error)            
hook: cleanup

Error: Error thrown outside of test function: Failed to read a named property 'WCT' from 'Window': Blocked a frame with origin "http://localhost:8081" from accessing a cross-origin frame.
  <unknown> at /components/wct-browser-legacy/browser.js:615