Removes remaining parents observations at dtor.

chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc

Index: chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
diff --git a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
index 7eba30c545d122961717503020966d959c9538f8..03b432c309707fc943bed5fabd681ec6e049fd69 100644
--- a/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
+++ b/chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.cc
@@ -180,6 +180,10 @@ SelectFileDialogImplGTK::SelectFileDialogImplGTK(Listener* listener,
 }
 
 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()));
   }