[rtp_rtcp] Lint build/header_guard errors fixed

webrtc/modules/rtp_rtcp/test/testFec/average_residual_loss_xor_codes.h

Index: webrtc/modules/rtp_rtcp/test/testFec/average_residual_loss_xor_codes.h
diff --git a/webrtc/modules/rtp_rtcp/test/testFec/average_residual_loss_xor_codes.h b/webrtc/modules/rtp_rtcp/test/testFec/average_residual_loss_xor_codes.h
index 2e8d676e47459a8225b69d62b5cef79085d6ff51..80e2310ac3fba4c27106299e717da55d6e15a02f 100644
--- a/webrtc/modules/rtp_rtcp/test/testFec/average_residual_loss_xor_codes.h
+++ b/webrtc/modules/rtp_rtcp/test/testFec/average_residual_loss_xor_codes.h
@@ -7,6 +7,8 @@
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
+#ifndef WEBRTC_MODULES_RTP_RTCP_TEST_TESTFEC_AVERAGE_RESIDUAL_LOSS_XOR_CODES_H_
+#define WEBRTC_MODULES_RTP_RTCP_TEST_TESTFEC_AVERAGE_RESIDUAL_LOSS_XOR_CODES_H_
 
 namespace {
 
@@ -186,3 +188,4 @@ const float kMaxResidualLossBurstyMask[kNumberCodes] = {
 };
 
 }  // namespace
+#endif  // WEBRTC_MODULES_RTP_RTCP_TEST_TESTFEC_AVERAGE_RESIDUAL_LOSS_XOR_CODES_H_