CHROMEG_VIRTUAL_CALLBACK_2 47 chrome/browser/ui/libgtk2ui/gtk2_signal.h CHROMEG_VIRTUAL_CALLBACK_2(CLASS, RETURN, METHOD, GtkWidget*, ARG1, ARG2); CHROMEG_VIRTUAL_CALLBACK_2 47 ui/base/gtk/gtk_signal.h CHROMEG_VIRTUAL_CALLBACK_2(CLASS, RETURN, METHOD, GtkWidget*, ARG1, ARG2);