First step of the BraveConfirmInfoBar refactor. Before refactoring BraveConfirmInfoBar, removed unused BraveConfirmInfoBar subclass. Dev channel deprecation infobar: not used anymore. Remove. Resolves - subtask of brave/brave-browser#48822
First step of the BraveConfirmInfoBar refactor. Before refactoring BraveConfirmInfoBar, removed unused BraveConfirmInfoBar subclass. Dev channel deprecation infobar: not used anymore. Remove. Resolves - subtask of brave/brave-browser#48822