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diff --git a/third_party/libwebrtc/p2p/base/basic_async_resolver_factory.h b/third_party/libwebrtc/p2p/base/basic_async_resolver_factory.h
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+++ b/third_party/libwebrtc/p2p/base/basic_async_resolver_factory.h
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+/*
+ *  Copyright 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 P2P_BASE_BASIC_ASYNC_RESOLVER_FACTORY_H_
+#define P2P_BASE_BASIC_ASYNC_RESOLVER_FACTORY_H_
+
+#include <functional>
+#include <memory>
+#include <utility>
+
+#include "api/async_dns_resolver.h"
+#include "api/async_resolver_factory.h"
+#include "rtc_base/async_resolver_interface.h"
+
+namespace webrtc {
+
+class BasicAsyncResolverFactory final : public AsyncResolverFactory {
+ public:
+  rtc::AsyncResolverInterface* Create() override;
+};
+
+// This class wraps a factory using the older webrtc::AsyncResolverFactory API,
+// and produces webrtc::AsyncDnsResolver objects that contain an
+// rtc::AsyncResolver object.
+class WrappingAsyncDnsResolverFactory final
+    : public AsyncDnsResolverFactoryInterface {
+ public:
+  explicit WrappingAsyncDnsResolverFactory(
+      std::unique_ptr<AsyncResolverFactory> wrapped_factory)
+      : owned_factory_(std::move(wrapped_factory)),
+        wrapped_factory_(owned_factory_.get()) {}
+
+  explicit WrappingAsyncDnsResolverFactory(
+      AsyncResolverFactory* non_owned_factory)
+      : wrapped_factory_(non_owned_factory) {}
+
+  std::unique_ptr<webrtc::AsyncDnsResolverInterface> CreateAndResolve(
+      const rtc::SocketAddress& addr,
+      std::function<void()> callback) override;
+
+  std::unique_ptr<webrtc::AsyncDnsResolverInterface> CreateAndResolve(
+      const rtc::SocketAddress& addr,
+      int family,
+      std::function<void()> callback) override;
+
+  std::unique_ptr<webrtc::AsyncDnsResolverInterface> Create() override;
+
+ private:
+  const std::unique_ptr<AsyncResolverFactory> owned_factory_;
+  AsyncResolverFactory* const wrapped_factory_;
+};
+
+}  // namespace webrtc
+
+#endif  // P2P_BASE_BASIC_ASYNC_RESOLVER_FACTORY_H_