Monitor udev for hidraw devices instead of hid devices.

device/hid/hid_service_linux.h

 // Copyright 2014 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 DEVICE_HID_HID_SERVICE_LINUX_H_
 #define DEVICE_HID_HID_SERVICE_LINUX_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "device/hid/device_monitor_linux.h"
@@ skipping 14 matching lines @@
   virtual scoped_refptr<HidConnection> Connect(const HidDeviceId& device_id)
       OVERRIDE;
 
   // Implements DeviceMonitorLinux::Observer:
   virtual void OnDeviceAdded(udev_device* device) OVERRIDE;
   virtual void OnDeviceRemoved(udev_device* device) OVERRIDE;
 
  private:
   virtual ~HidServiceLinux();
 
-  static bool FindHidrawDevNode(udev_device* parent, std::string* result);
-
   DISALLOW_COPY_AND_ASSIGN(HidServiceLinux);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_HID_HID_SERVICE_LINUX_H_