Revert to enumerating all X windows if the Window Manager doesn't support _NE...

chrome/common/gtk_util.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_COMMON_GTK_UTIL_H_
 #define CHROME_COMMON_GTK_UTIL_H_
 
 #include <gtk/gtk.h>
 #include <string>
 
@@ skipping 70 matching lines @@
 void CenterWidgetInHBox(GtkWidget* hbox, GtkWidget* widget, bool pack_at_end,
                         int padding);
 
 // Change windows accelerator style to GTK style. (GTK uses _ for
 // accelerators.  Windows uses & with && as an escape for &.)
 std::string ConvertAcceleratorsFromWindowsStyle(const std::string& label);
 
 // Returns true if the screen is composited, false otherwise.
 bool IsScreenComposited();
 
-// Implementers of this interface receive a notification for every top-level
-// gdk window of the current display.
-class EnumerateWindowsDelegate {
- public:
-  // |xid| is the X Window ID of the enumerated window.  Return true to stop
-  // further iteration.
-  virtual bool ShouldStopIterating(XID xid) = 0;
-};
-
 // Enumerates the top-level gdk windows of the current display.
-void EnumerateChildWindows(EnumerateWindowsDelegate* delegate);
+void EnumerateTopLevelWindows(x11_util::EnumerateWindowsDelegate* delegate);
 
 // Set that a button causes a page navigation. In particular, it will accept
 // middle clicks. Warning: only call this *after* you have connected your
 // own handlers for button-press and button-release events, or you will not get
 // those events.
 void SetButtonTriggersNavigation(GtkWidget* button);
 
 }  // namespace gtk_util
 
 #endif  // CHROME_COMMON_GTK_UTIL_H_