Fix Chromium clang plugin warnings

webrtc/modules/audio_processing/three_band_filter_bank.h

Index: webrtc/modules/audio_processing/three_band_filter_bank.h
diff --git a/webrtc/modules/audio_processing/three_band_filter_bank.h b/webrtc/modules/audio_processing/three_band_filter_bank.h
index eb9b99ee3b1ffce0de748c29c37d5f3699ebf96b..24e7831d730e62682f6309eafccffc7d8912068b 100644
--- a/webrtc/modules/audio_processing/three_band_filter_bank.h
+++ b/webrtc/modules/audio_processing/three_band_filter_bank.h
@@ -35,6 +35,7 @@ namespace webrtc {
 class ThreeBandFilterBank final {
  public:
   explicit ThreeBandFilterBank(size_t length);
+  ~ThreeBandFilterBank();
 
   // Splits |in| into 3 downsampled frequency bands in |out|.
   // |length| is the |in| length. Each of the 3 bands of |out| has to have a