Removes remaining parents observations at dtor.

chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc

 // Copyright (c) 2012 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 <gtk/gtk.h>
 #include <map>
 #include <set>
 #include <vector>
 
 // Xlib defines RootWindow
@@ skipping 162 matching lines @@
   return new SelectFileDialogImplGTK(listener, policy);
 }
 
 SelectFileDialogImplGTK::SelectFileDialogImplGTK(Listener* listener,
                                                  ui::SelectFilePolicy* policy)
     : SelectFileDialogImpl(listener, policy),
       preview_(NULL) {
 }
 
 SelectFileDialogImplGTK::~SelectFileDialogImplGTK() {
+  for (std::set<aura::Window*>::iterator iter = parents_.begin();
+       iter != parents_.end(); ++iter) {
+    (*iter)->RemoveObserver(this);
+  }
   while (dialogs_.begin() != dialogs_.end()) {
     gtk_widget_destroy(*(dialogs_.begin()));
   }
 }
 
 bool SelectFileDialogImplGTK::IsRunning(gfx::NativeWindow parent_window) const {
   return parents_.find(parent_window) != parents_.end();
 }
 
 bool SelectFileDialogImplGTK::HasMultipleFileTypeChoicesImpl() {
@@ skipping 425 matching lines @@
   g_free(filename);
   if (pixbuf) {
     gtk_image_set_from_pixbuf(GTK_IMAGE(preview_), pixbuf);
     g_object_unref(pixbuf);
   }
   gtk_file_chooser_set_preview_widget_active(GTK_FILE_CHOOSER(chooser),
                                              pixbuf ? TRUE : FALSE);
 }
 
 }  // namespace libgtk2ui