Virtual destructors should have virtual keyword.

webkit/plugins/ppapi/ppb_audio_impl.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_PLUGINS_PPAPI_PPB_AUDIO_IMPL_H_
 #define WEBKIT_PLUGINS_PPAPI_PPB_AUDIO_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/shared_memory.h"
@@ skipping 13 matching lines @@
 namespace ppapi {
 
 class PluginInstance;
 
 // The implementation is actually in AudioConfigImpl.
 class PPB_AudioConfig_Impl : public Resource,
                              public ::ppapi::AudioConfigImpl {
  public:
   // Note that you must call Init (on AudioConfigImpl) before using this class.
   PPB_AudioConfig_Impl(PluginInstance* instance);
-  ~PPB_AudioConfig_Impl();
+  virtual ~PPB_AudioConfig_Impl();
 
   // ResourceObjectBase overrides.
   virtual ::ppapi::thunk::PPB_AudioConfig_API* AsAudioConfig_API() OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PPB_AudioConfig_Impl);
 };
 
 // Some of the backend functionality of this class is implemented by the
 // AudioImpl so it can be shared with the proxy.
@@ skipping 53 matching lines @@
   size_t shared_memory_size_for_create_callback_;
   scoped_ptr<base::SyncSocket> socket_for_create_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Audio_Impl);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPB_AUDIO_IMPL_H_