Remove window setters command handlers on mobile

Editor assessment

The subject states the removal (window setters command handlers dropped on mobile) but not the reason, leaving it unclear whether the handlers were broken, unsupported, or redundant on mobile. Type fix suggests a defect, which the message never names. Scope core is accurate. No body supplies the motivation, and no footers appear. The action is communicated, the rationale is not, and for a removal the rationale is the interesting part.