Fix Chromium clang plugin warnings

webrtc/modules/audio_processing/splitting_filter.h

Index: webrtc/modules/audio_processing/splitting_filter.h
diff --git a/webrtc/modules/audio_processing/splitting_filter.h b/webrtc/modules/audio_processing/splitting_filter.h
index 2828df361452f962ab2eef8e6da4d087cff85a40..2d3750ae6048417bce3188c26f1de55b15e3e644 100644
--- a/webrtc/modules/audio_processing/splitting_filter.h
+++ b/webrtc/modules/audio_processing/splitting_filter.h
@@ -46,6 +46,7 @@ struct TwoBandsStates {
 class SplittingFilter {
  public:
   SplittingFilter(size_t num_channels, size_t num_bands, size_t num_frames);
+  ~SplittingFilter();
 
   void Analysis(const IFChannelBuffer* data, IFChannelBuffer* bands);
   void Synthesis(const IFChannelBuffer* bands, IFChannelBuffer* data);