Remove unused BrowserWindow.fromDevToolsWebContents

Editor assessment

The subject states the removal: the unused BrowserWindow.fromDevToolsWebContents method deleted. The chore type fits dead-code removal, and the absent scope is tolerable. No body is present, which is acceptable because the subject names the exact method, its class, and the reason — disuse — completely, leaving nothing for a diff to explain. The PR reference is well-formed. Imperative mood, no trailing period, compact length. A precise, self-sufficient cleanup message that a reader can verify at a glance.