Adding use_system_libusb option for third_party/libusb

chrome/browser/usb/usb_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_USB_USB_SERVICE_H_
 #define CHROME_BROWSER_USB_USB_SERVICE_H_
 #pragma once
 
 #include <map>
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/threading/thread.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/usb/usb_device.h"
-#include "third_party/libusb/libusb/libusb.h"
+#include "third_party/libusb/libusb.h"
 
 typedef libusb_context* PlatformUsbContext;
 
 // The USB service handles creating and managing an event handler thread that is
 // used to manage and dispatch USB events. It is also responsbile for device
 // discovery on the system, which allows it to re-use device handles to prevent
 // competition for the same USB device.
 class UsbService : public ProfileKeyedService {
  public:
   UsbService();
@@ skipping 32 matching lines @@
   // their vendor and product id. This allows for reusing an open device without
   // creating another platform handle for it.
   typedef std::map<std::pair<uint16, uint16>, scoped_refptr<UsbDevice> >
       DeviceMap;
   DeviceMap devices_;
 
   DISALLOW_EVIL_CONSTRUCTORS(UsbService);
 };
 
 #endif  // CHROME_BROWSER_USB_USB_SERVICE_H_