Adding use_system_libusb option for third_party/libusb

chrome/browser/usb/usb_device.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 "chrome/browser/usb/usb_device.h"
 
 #include "base/stl_util.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/usb/usb_service.h"
-#include "third_party/libusb/libusb/libusb.h"
+#include "third_party/libusb/libusb.h"
 
 namespace {
 
 static uint8 ConvertTransferDirection(
     const UsbDevice::TransferDirection direction) {
   switch (direction) {
     case UsbDevice::INBOUND:
       return LIBUSB_ENDPOINT_IN;
     case UsbDevice::OUTBOUND:
       return LIBUSB_ENDPOINT_OUT;
@@ skipping 135 matching lines @@
                             const net::CompletionCallback& callback) {
   Transfer transfer;
   transfer.buffer = buffer;
   transfer.callback = callback;
 
   {
     base::AutoLock lock(lock_);
     transfers_[handle] = transfer;
   }
 }