x11: Use scoped_ptr<> for X11 objects where it makes sense.

ui/base/idle/idle_query_x11.cc

 // Copyright (c) 2012 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/idle/idle_query_x11.h"
 
 #include <X11/extensions/scrnsaver.h>
 
 #include "ui/gfx/x/x11_types.h"
 
 namespace ui {
 
 class IdleData {
  public:
   IdleData() {
     int event_base;
     int error_base;
     if (XScreenSaverQueryExtension(gfx::GetXDisplay(), &event_base,
                                    &error_base)) {
-      mit_info = XScreenSaverAllocInfo();
-    } else {
-      mit_info = NULL;
+      mit_info.reset(XScreenSaverAllocInfo());
     }
   }
 
   ~IdleData() {
-    if (mit_info)
-      XFree(mit_info);
   }
 
-  XScreenSaverInfo *mit_info;
+  gfx::XScopedPtr<XScreenSaverInfo> mit_info;
 };
 
 IdleQueryX11::IdleQueryX11() : idle_data_(new IdleData()) {}
 
 IdleQueryX11::~IdleQueryX11() {}
 
 int IdleQueryX11::IdleTime() {
   if (!idle_data_->mit_info)
     return 0;
 
   if (XScreenSaverQueryInfo(gfx::GetXDisplay(),
                             RootWindow(gfx::GetXDisplay(), 0),
-                            idle_data_->mit_info)) {
+                            idle_data_->mit_info.get())) {
     return (idle_data_->mit_info->idle) / 1000;
   } else {
     return 0;
   }
 }
 
 }  // namespace ui