Remove obsolete display-buffer-reuse-frames from manuals.

* doc/emacs/windows.texi (Window Choice): Don't mention obsolete
display-buffer-reuse-frames.

* doc/lispref/windows.texi (Display Action Functions)
(Choosing Window Options): Remove obsolete variable
display-buffer-reuse-frames.

doc/emacs/ChangeLog

+2012-09-07  Chong Yidong  <cyd@gnu.org>
+
+	* windows.texi (Window Choice): Don't mention obsolete
+	display-buffer-reuse-frames.
+
 2012-09-04  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Give more-useful info on a fatal error (Bug#12328).

doc/emacs/windows.texi

@@ -378,12 +378,10 @@ adding the desired buffer's name to the list
 expression to the list @code{same-window-regexps}.  By default, these
 variables are @code{nil}, so this step is skipped.
 
-@vindex display-buffer-reuse-frames
 @item
 Otherwise, if the buffer is already displayed in an existing window,
 ``reuse'' that window.  Normally, only windows on the selected frame
 are considered, but windows on other frames are also reusable if you
-change @code{display-buffer-reuse-frames} to @code{t}, or if you
 change @code{pop-up-frames} (see below) to @code{t}.
 
 @item

doc/lispref/ChangeLog

 2012-09-07  Chong Yidong  <cyd@gnu.org>
 
+	* windows.texi (Display Action Functions)
+	(Choosing Window Options): Remove obsolete variable
+	display-buffer-reuse-frames.
+
 	* positions.texi (Narrowing): Document buffer-narrowed-p.
 
 	* markers.texi (Moving Markers): Add xref to Point (Bug#7151).

doc/lispref/windows.texi

@@ -1728,8 +1728,7 @@ A frame means consider windows on that frame only.
 @end itemize
 
 If @var{alist} contains no @code{reusable-frames} entry, this function
-normally searches just the selected frame; however, if either the
-variable @code{display-buffer-reuse-frames} or the variable
+normally searches just the selected frame; however, if the variable
 @code{pop-up-frames} is non-@code{nil}, it searches all frames on the
 current terminal.  @xref{Choosing Window Options}.
 
@@ -1769,14 +1768,6 @@ The behavior of the standard display actions of @code{display-buffer}
 (@pxref{Choosing Window}) can be modified by a variety of user
 options.
 
-@defopt display-buffer-reuse-frames
-If the value of this variable is non-@code{nil}, @code{display-buffer}
-may search all frames on the current terminal when looking for a
-window already displaying the specified buffer.  The default is
-@code{nil}.  This variable is consulted by the action function
-@code{display-buffer-reuse-window} (@pxref{Display Action Functions}).
-@end defopt
-
 @defopt pop-up-windows
 If the value of this variable is non-@code{nil}, @code{display-buffer}
 is allowed to split an existing window to make a new window for

etc/NEWS

@@ -671,7 +671,7 @@ specifies frame parameters to give any newly-created frame.
 *** The following variables are obsolete, as they can be replaced by
 appropriate entries in the `display-buffer-alist' function introduced
 in Emacs 24.1:
-
++++
 **** `display-buffer-reuse-frames'
 **** `special-display-regexps'
 **** `special-display-frame-alist'