Revert of Fix chromium-style warnings.

webrtc/modules/rtp_rtcp/source/rtp_rtcp_defines_nullimpl.cc

-/*
- *  Copyright (c) 2016 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.
- */
-
-#include "webrtc/modules/rtp_rtcp/source/rtp_rtcp_defines_nullimpl.h"
-
-namespace webrtc {
-
-int32_t NullRtpFeedback::OnInitializeDecoder(
-    int8_t payload_type,
-    const char payloadName[RTP_PAYLOAD_NAME_SIZE],
-    int frequency,
-    size_t channels,
-    uint32_t rate) {
-  return 0;
-}
-
-int32_t NullRtpData::OnReceivedPayloadData(const uint8_t* payload_data,
-                                           size_t payload_size,
-                                           const WebRtcRTPHeader* rtp_header) {
-  return 0;
-}
-
-bool NullRtpData::OnRecoveredPacket(const uint8_t* packet,
-                                    size_t packet_length) {
-  return true;
-}
-
-}  // namespace webrtc