Update from https://crrev.com/315085

net/udp/udp_server_socket.h

Index: net/udp/udp_server_socket.h
diff --git a/net/udp/udp_server_socket.h b/net/udp/udp_server_socket.h
index 07991054d29cfbf9e20663f9ee685d2c0dbe7b10..dabb8f0b100a5dfef6af5b6242b067b13a9fbc97 100644
--- a/net/udp/udp_server_socket.h
+++ b/net/udp/udp_server_socket.h
@@ -47,6 +47,12 @@ class NET_EXPORT UDPServerSocket : public DatagramServerSocket {
   int SetDiffServCodePoint(DiffServCodePoint dscp) override;
   void DetachFromThread() override;
 
+#if defined(OS_WIN)
+  // Switch to use non-blocking IO. Must be called right after construction and
+  // before other calls.
+  void UseNonBlockingIO();
+#endif
+
  private:
   UDPSocket socket_;
   bool allow_address_reuse_;