Use GetXDisplay() instead of XOpenDisplay() in IdleQueryLinux.

chrome/browser/idle_query_linux.cc

 // 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.
 
 #include "chrome/browser/idle_query_linux.h"
 
-#include <X11/Xlib.h>
 #include <X11/extensions/scrnsaver.h>
+#include "ui/base/x/x11_util.h"
 
 namespace browser {
 
 class IdleData {
  public:
   IdleData() {
     int event_base;
     int error_base;
-    display = XOpenDisplay(NULL);
-    if (XScreenSaverQueryExtension(display, &event_base, &error_base)) {
+    if (XScreenSaverQueryExtension(ui::GetXDisplay(), &event_base,
+                                   &error_base)) {
       mit_info = XScreenSaverAllocInfo();
     } else {
       mit_info = NULL;
     }
   }
 
   ~IdleData() {
-    if (display) {
-      XCloseDisplay(display);
-      display = NULL;
-    }
     if (mit_info)
       XFree(mit_info);
   }
 
   XScreenSaverInfo *mit_info;
-  Display *display;
 };
 
 IdleQueryLinux::IdleQueryLinux() : idle_data_(new IdleData()) {}
 
 IdleQueryLinux::~IdleQueryLinux() {}
 
 int IdleQueryLinux::IdleTime() {
-  if (!idle_data_->mit_info || !idle_data_->display)
+  if (!idle_data_->mit_info)
     return 0;
 
-  if (XScreenSaverQueryInfo(idle_data_->display,
-                            RootWindow(idle_data_->display, 0),
+  if (XScreenSaverQueryInfo(ui::GetXDisplay(),
+                            RootWindow(ui::GetXDisplay(), 0),
                             idle_data_->mit_info)) {
     return (idle_data_->mit_info->idle) / 1000;
   } else {
     return 0;
   }
 }
 
 }  // namespace browser