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diff --git a/third_party/libwebrtc/rtc_base/system/unused.h b/third_party/libwebrtc/rtc_base/system/unused.h
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+/*
+ * Copyright (c) 2018 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.
+ */
+
+#ifndef RTC_BASE_SYSTEM_UNUSED_H_
+#define RTC_BASE_SYSTEM_UNUSED_H_
+
+// Prevent the compiler from warning about an unused variable. For example:
+// int result = DoSomething();
+// RTC_DCHECK(result == 17);
+// RTC_UNUSED(result);
+// Note: In most cases it is better to remove the unused variable rather than
+// suppressing the compiler warning.
+#ifndef RTC_UNUSED
+#ifdef __cplusplus
+#define RTC_UNUSED(x) static_cast<void>(x)
+#else
+#define RTC_UNUSED(x) (void)(x)
+#endif
+#endif // RTC_UNUSED
+
+#endif // RTC_BASE_SYSTEM_UNUSED_H_