Rename nacl::RefCounted to nacl::RefCountedThreadSafe

ppapi/native_client/src/shared/ppapi_proxy/plugin_ppb_audio_config.h

 // Copyright (c) 2012 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 NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_AUDIO_CONFIG_H_
 #define NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_AUDIO_CONFIG_H_
 
 #include "native_client/src/include/nacl_macros.h"
 #include "native_client/src/shared/ppapi_proxy/plugin_resource.h"
 #include "ppapi/c/ppb_audio_config.h"
 
 namespace ppapi_proxy {
 
 // Implements the untrusted side of the PPB_AudioConfig interface.
 class PluginAudioConfig : public PluginResource {
  public:
   static const PPB_AudioConfig* GetInterface();
   // Returns the 1.0 interface to support backwards-compatibility.
   static const PPB_AudioConfig_1_0* GetInterface1_0();
 
+ protected:
+  virtual ~PluginAudioConfig() {}
+
  private:
   NACL_DISALLOW_COPY_AND_ASSIGN(PluginAudioConfig);
 };
 
 }  // namespace ppapi_proxy
 
 #endif  // NATIVE_CLIENT_SRC_SHARED_PPAPI_PROXY_PLUGIN_AUDIO_CONFIG_H_