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

base/x11/x11_error_tracker_gtk.cc

 // 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.
 
-#include "ui/base/x/x11_error_tracker.h"
+#include "base/x11/x11_error_tracker.h"
 
 #include <gdk/gdkx.h>
 
 #include "base/logging.h"
 
-namespace ui {
+namespace base {
 
 X11ErrorTracker::X11ErrorTracker() {
   gdk_error_trap_push();
 }
 
 X11ErrorTracker::~X11ErrorTracker() {
   gdk_error_trap_pop();
 }
 
 bool X11ErrorTracker::FoundNewError() {
   gdk_flush();
   bool found_error = gdk_error_trap_pop() != 0;
 
   gdk_error_trap_push();
   return found_error;
 }
 
-}  // namespace ui
+}  // namespace base