Fix Chromium clang plugin warnings

webrtc/modules/audio_processing/level_controller/signal_classifier.h

 /*
  *  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 19 matching lines @@
 
   explicit SignalClassifier(ApmDataDumper* data_dumper);
   ~SignalClassifier();
 
   void Initialize(int sample_rate_hz);
   void Analyze(const AudioBuffer& audio, SignalType* signal_type);
 
  private:
   class FrameExtender {
    public:
-    FrameExtender(size_t frame_size, size_t extended_frame_size)
-        : x_old_(extended_frame_size - frame_size, 0.f) {}
+    FrameExtender(size_t frame_size, size_t extended_frame_size);
+    ~FrameExtender();
 
     void ExtendFrame(rtc::ArrayView<const float> x,
                      rtc::ArrayView<float> x_extended);
 
    private:
     std::vector<float> x_old_;
 
     RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(FrameExtender);
   };
 
   ApmDataDumper* const data_dumper_;
   DownSampler down_sampler_;
   std::unique_ptr<FrameExtender> frame_extender_;
   NoiseSpectrumEstimator noise_spectrum_estimator_;
   int sample_rate_hz_;
   int initialization_frames_left_;
   int consistent_classification_counter_;
   SignalType last_signal_type_;
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(SignalClassifier);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_LEVEL_CONTROLLER_SIGNAL_CLASSIFIER_H_