Fix Chromium clang plugin warnings

webrtc/modules/audio_coding/acm2/acm_receive_test_oldapi.h

 /*
  *  Copyright (c) 2014 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.
  */
 
@@ skipping 20 matching lines @@
   enum NumOutputChannels {
     kArbitraryChannels = 0,
     kMonoOutput = 1,
     kStereoOutput = 2
   };
 
   AcmReceiveTestOldApi(PacketSource* packet_source,
                        AudioSink* audio_sink,
                        int output_freq_hz,
                        NumOutputChannels exptected_output_channels);
-  virtual ~AcmReceiveTestOldApi() {}
+  virtual ~AcmReceiveTestOldApi();
 
   // Registers the codecs with default parameters from ACM.
   void RegisterDefaultCodecs();
 
   // Registers codecs with payload types matching the pre-encoded NetEq test
   // files.
   void RegisterNetEqTestCodecs();
 
   int RegisterExternalReceiveCodec(int rtp_payload_type,
                                    AudioDecoder* external_decoder,
@@ skipping 36 matching lines @@
 
   const int output_freq_hz_1_;
   const int output_freq_hz_2_;
   const int toggle_period_ms_;
   int64_t last_toggle_time_ms_;
 };
 
 }  // namespace test
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_ACM2_ACM_RECEIVE_TEST_OLDAPI_H_