* completer.h (get_gdb_completer_word_break_characters): Delete.
* completer.c: include language.h.
(gdb_completer_word_break_characters): Delete.
(get_gdb_completer_word_break_characters): Delete.
(location_completer): Use the word break characters of the current
language.
(complete_line): Likewise.
(line_completion_function): Likewise.
(skip_quoted_chars): Likewise.
* Makefile.in (completer.o): Add dependency on language.h.
* top.c (init_main): Set the readline word break characters
to GDB's default word break characters.