Fixed the clang warning for ApmDataDumper

webrtc/modules/audio_processing/logging/apm_data_dumper.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.
  */
 
@@ skipping 20 matching lines @@
                          const std::string& suffix) {
   std::stringstream ss;
   ss << name << "_" << instance_index << "-" << reinit_index << suffix;
   return ss.str();
 }
 #endif
 
 }  // namespace
 
 #if WEBRTC_AEC_DEBUG_DUMP == 1
+ApmDataDumper::ApmDataDumper(int instance_index)
+    : instance_index_(instance_index) {}
+#else
+ApmDataDumper::ApmDataDumper(int instance_index) {}
+#endif
+
+ApmDataDumper::~ApmDataDumper() {}
+
+#if WEBRTC_AEC_DEBUG_DUMP == 1
 FILE* ApmDataDumper::GetRawFile(const char* name) {
   std::string filename =
       FormFileName(name, instance_index_, recording_set_index_, ".dat");
   auto& f = raw_files_[filename];
   if (!f) {
     f.reset(fopen(filename.c_str(), "wb"));
   }
   return f.get();
 }
 
 WavWriter* ApmDataDumper::GetWavFile(const char* name,
                                      int sample_rate_hz,
                                      int num_channels) {
   std::string filename =
       FormFileName(name, instance_index_, recording_set_index_, ".wav");
   auto& f = wav_files_[filename];
   if (!f) {
     f.reset(new WavWriter(filename.c_str(), sample_rate_hz, num_channels));
   }
   return f.get();
 }
 
 #endif
 
 }  // namespace webrtc