Garbage collect window_hook

I checked, and Insight doesn't set this.

gdb/ChangeLog:
2016-03-09  Pedro Alves  <palves@redhat.com>

	* top.c (window_hook): Delete.
	(command_loop): Remove references to window_hook.

2 files changed, 5 insertions, 9 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9e35d300725..d220a0223e1 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2016-03-09  Pedro Alves  <palves@redhat.com>
 
+	* top.c (window_hook): Delete.
+	(command_loop): Remove references to window_hook.
+
+2016-03-09  Pedro Alves  <palves@redhat.com>
+
 	* gdb.base/command-line-input.exp: New file.
 
 2016-03-09  Marcin Kościelnicki  <koriakin@0x04.net>
diff --git a/gdb/top.c b/gdb/top.c
index ed200ba7b4e..b5ee4af33fd 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -124,12 +124,6 @@ char *current_directory;
 /* The directory name is actually stored here (usually).  */
 char gdb_dirbuf[1024];
 
-/* Function to call before reading a command, if nonzero.
-   The function receives two args: an input stream,
-   and a prompt string.  */
-
-void (*window_hook) (FILE *, char *);
-
 /* Buffer used for reading command lines, and the size
    allocated for it so far.  */
 
@@ -545,9 +539,6 @@ command_loop (void)
 
   while (instream && !feof (instream))
     {
-      if (window_hook && instream == stdin)
-	(*window_hook) (instream, get_prompt ());
-
       clear_quit_flag ();
       if (instream == stdin)
 	reinitialize_more_filter ();