fix: crash when closing devtools after focus #47435
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Description of Change
Closes #19985.
Fixes an issue where closing devtools immediately after focus causes a crash. The crash happened because closing DevTools immediately destroys the DevTools WebContents while the main WebContents is still notifying observers for the focus event, which is prohibited.
Checklist
npm test
passesRelease Notes
Notes: Fixed an issue where closing devtools immediately after focus caused a crash.