revert r53268:

chrome/browser/gtk/browser_window_gtk.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/gtk/browser_window_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include <string>
 
@@ skipping 646 matching lines @@
 
 void BrowserWindowGtk::SetBounds(const gfx::Rect& bounds) {
   SetBoundsImpl(bounds, true);
 }
 
 void BrowserWindowGtk::Close() {
   // We're already closing.  Do nothing.
   if (!window_)
     return;
 
-  // Sometimes the tabstrip will get stuck thinking it's in a drag session.
-  // Short of figuring out a repro case and actually solving the problem, this
-  // is the best way to avoid an immortal window. See http://crbug.com/23733
-  tabstrip_->CancelActiveDragSession();
-
   if (!CanClose())
     return;
 
   // We're going to destroy the window, make sure the tab strip isn't running
   // any animations which may still reference GtkWidgets.
   tabstrip_->StopAnimation();
 
   SaveWindowPosition();
 
   if (accel_group_) {
@@ skipping 1464 matching lines @@
   // special-case the ones where the custom frame should be used.  These names
   // are taken from the WMs' source code.
   return (wm_name == "Blackbox" ||
           wm_name == "compiz" ||
           wm_name == "e16" ||  // Enlightenment DR16
           wm_name == "Metacity" ||
           wm_name == "Mutter" ||
           wm_name == "Openbox" ||
           wm_name == "Xfwm4");
 }