Move ui/base/x/x11_error_tracker to base/x11.

base/x11/x11_error_tracker.h

 // Copyright (c) 2013 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 BASE_X11_X11_ERROR_TRACKER_H_
+#define BASE_X11_X11_ERROR_TRACKER_H_
+
 #include <X11/Xlib.h>
 
+#include "base/base_export.h"
 #include "base/basictypes.h"
-#include "ui/base/ui_export.h"
 
-namespace ui {
+namespace base {
 
 // X11ErrorTracker catches X11 errors in a non-fatal way. It does so by
 // temporarily changing the X11 error handler. The old error handler is
 // restored when the tracker is destroyed.
-class UI_EXPORT X11ErrorTracker {
+class BASE_EXPORT X11ErrorTracker {
  public:
   X11ErrorTracker();
   ~X11ErrorTracker();
 
   // Returns whether an X11 error happened since this function was last called
   // (or since the creation of the tracker). This is potentially expensive,
   // since this causes a sync with the X server.
   bool FoundNewError();
 
  private:
 #if !defined(TOOLKIT_GTK)
   XErrorHandler old_handler_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(X11ErrorTracker);
 };
 
-}  // namespace ui
+}  // namespace base
+
+#endif  // BASE_X11_X11_ERROR_TRACKER_H_