Gtk: fix GTK_TYPE_PERSERVE_WINDOW typo.

ui/gfx/gtk_preserve_window.h

 // Copyright (c) 2011 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 UI_GFX_GTK_PRESERVE_WINDOW_H_
 #define UI_GFX_GTK_PRESERVE_WINDOW_H_
 #pragma once
 
 #include <gdk/gdk.h>
 #include <gtk/gtk.h>
 
 #include "ui/ui_api.h"
 
 // GtkFixed creates an X window when realized and destroys an X window
 // when unrealized. GtkPreserveWindow allows overrides this
 // behaviour. When preserve is set (via gtk_preserve_window_set_preserve),
 // the X window is only destroyed when the widget is destroyed.
 
 G_BEGIN_DECLS
 
 #define GTK_TYPE_PRESERVE_WINDOW                                 \
     (gtk_preserve_window_get_type())
 #define GTK_PRESERVE_WINDOW(obj)                                 \
-    (G_TYPE_CHECK_INSTANCE_CAST((obj), GTK_TYPE_PERSERVE_WINDOW, \
+    (G_TYPE_CHECK_INSTANCE_CAST((obj), GTK_TYPE_PRESERVE_WINDOW, \
                                 GtkPreserveWindow))
 #define GTK_PRESERVE_WINDOW_CLASS(klass)                         \
     (G_TYPE_CHECK_CLASS_CAST((klass), GTK_TYPE_PRESERVE_WINDOW,  \
                              GtkPreserveWindowClass))
 #define GTK_IS_PRESERVE_WINDOW(obj)                              \
     (G_TYPE_CHECK_INSTANCE_TYPE((obj), GTK_TYPE_PRESERVE_WINDOW))
 #define GTK_IS_PRESERVE_WINDOW_CLASS(klass)                      \
     (G_TYPE_CHECK_CLASS_TYPE((klass), GTK_TYPE_PRESERVE_WINDOW))
 #define GTK_PRESERVE_WINDOW_GET_CLASS(obj)                       \
     (G_TYPE_INSTANCE_GET_CLASS((obj), GTK_TYPE_PRESERVE_WINDOW,  \
@@ skipping 22 matching lines @@
 
 // Whether or not someone else will gdk_window_resize the GdkWindow associated
 // with this widget (needed by the GPU process to synchronize resizing
 // with swapped between front and back buffer).
 UI_API void gtk_preserve_window_delegate_resize(GtkPreserveWindow* widget,
                                                 gboolean delegate);
 
 G_END_DECLS
 
 #endif  // UI_GFX_GTK_PRESERVE_WINDOW_H_