Fix Chromium clang plugin warnings

webrtc/common_audio/sparse_fir_filter.h

 /*
  *  Copyright (c) 2015 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 15 matching lines @@
   // |nonzero_coeffs|. They are assumed to be uniformly distributed every
   // |sparsity| samples and with an initial |offset|. The rest of the filter
   // coefficients will be assumed zeros. For example, with sparsity = 3, and
   // offset = 1 the filter coefficients will be:
   // B = [0 coeffs[0] 0 0 coeffs[1] 0 0 coeffs[2] ... ]
   // All initial state values will be zeros.
   SparseFIRFilter(const float* nonzero_coeffs,
                   size_t num_nonzero_coeffs,
                   size_t sparsity,
                   size_t offset);
+  ~SparseFIRFilter();
 
   // Filters the |in| data supplied.
   // |out| must be previously allocated and it must be at least of |length|.
   void Filter(const float* in, size_t length, float* out);
 
  private:
   const size_t sparsity_;
   const size_t offset_;
   const std::vector<float> nonzero_coeffs_;
   std::vector<float> state_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(SparseFIRFilter);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_AUDIO_SPARSE_FIR_FILTER_H_