Electron Releases

Description of Change

The chrome.scripting registerContentScripts spec registers a content script with the fixed id 'session-script', in a session that persists across retries.
On a retry, the earlier attempt's script is still registered.
registerContentScripts() then rejects with "Duplicate script ID 'session-script'", the background page never responds, and the retry times out.

This change makes the fixture's background page unregister that id first if it's already registered.
Only test code changes.

Validation

Ran on a local Linux testing build of main under Xvfb:

• e test --files spec/extensions.spec.ts -g chrome.scripting: 5 passed.
• As a control, I made the test throw once on its first attempt and ran it with CI retries (CI=1). With the old fixture, the retry logged "Duplicate script ID 'session-script'" and failed. With this change, the retry passed.
• script/lint.js --js passes.

🤖 Generated with Claude Code

Checklist

• I have built and tested this change
• I have filled out the PR description
• I have reviewed and verified the changes
• npm test passes
• tests are changed or added
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: none