Google codestyle prescribes sorting #include filenames within a section....

chrome/browser/chromeos/usb_mount_observer.h

 // Copyright (c) 2009 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 CHROME_BROWSER_CHROMEOS_USB_MOUNT_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_USB_MOUNT_OBSERVER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "chrome/browser/chromeos/cros/mount_library.h"
 #include "chrome/common/notification_observer.h"
+#include "chrome/common/notification_registrar.h"
 #include "chrome/common/notification_source.h"
 #include "chrome/common/notification_type.h"
-#include "chrome/common/notification_registrar.h"
 
 class Browser;
 class Profile;
 
 namespace chromeos { // NOLINT
 
 // Used to monitor mount changes and popup a new window when
 // a new mounted usb device is found.
 class USBMountObserver : public chromeos::MountLibrary::Observer,
                          public NotificationObserver {
@@ skipping 33 matching lines @@
                       bool small);
 
   std::vector<BrowserWithPath> browsers_;
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(USBMountObserver);
 };
 
 } // namespace chromeos
 #endif  // CHROME_BROWSER_CHROMEOS_USB_MOUNT_OBSERVER_H_