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

ui/base/x/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 <gdk/gdkx.h>
-
-#include "base/logging.h"
-
-namespace ui {
-
-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