Remove unused libudev on Linux.

webrtc/media/devices/v4llookup.h

-/*
- *  Copyright (c) 2009 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-/*
- * Author: lexnikitin@google.com (Alexey Nikitin)
- *
- * V4LLookup provides basic functionality to work with V2L2 devices in Linux
- * The functionality is implemented as a class with virtual methods for
- * the purpose of unit testing.
- */
-#ifndef WEBRTC_MEDIA_DEVICES_V4LLOOKUP_H_
-#define WEBRTC_MEDIA_DEVICES_V4LLOOKUP_H_
-
-#include <string>
-
-#ifdef WEBRTC_LINUX
-namespace cricket {
-class V4LLookup {
- public:
-  virtual ~V4LLookup() {}
-
-  static bool IsV4L2Device(const std::string& device_path) {
-    return GetV4LLookup()->CheckIsV4L2Device(device_path);
-  }
-
-  static void SetV4LLookup(V4LLookup* v4l_lookup) {
-    v4l_lookup_ = v4l_lookup;
-  }
-
-  static V4LLookup* GetV4LLookup() {
-    if (!v4l_lookup_) {
-      v4l_lookup_ = new V4LLookup();
-    }
-    return v4l_lookup_;
-  }
-
- protected:
-  static V4LLookup* v4l_lookup_;
-  // Making virtual so it is easier to mock
-  virtual bool CheckIsV4L2Device(const std::string& device_path);
-};
-
-}  // namespace cricket
-
-#endif  // WEBRTC_LINUX
-#endif  // WEBRTC_MEDIA_DEVICES_V4LLOOKUP_H_