* infcmd.c (finish_backward): Use breakpoint_set_silent.

	* infcmd.c (finish_backward): Use breakpoint_set_silent.
	* python/py-breakpoint.c (bppy_set_silent): Use
	breakpoint_set_silent.
	(bppy_set_thread): Use breakpoint_set_thread.
	(bppy_set_task): Use breakpoint_set_task.
	* breakpoint.h (breakpoint_set_silent, breakpoint_set_thread)
	(breakpoint_set_task): Declare.
	(make_breakpoint_silent): Remove.
	* breakpoint.c (breakpoint_set_silent): New function.
	(breakpoint_set_thread): Likewise.
	(breakpoint_set_task): Likewise.
	(make_breakpoint_silent): Remove.