Add virtual destructors for the Pepper API thunks.

ppapi/thunk/resource_creation_api.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 PPAPI_THUNK_RESOURCE_CREATION_API_H_
 #define PPAPI_THUNK_RESOURCE_CREATION_API_H_
 
 #include "ppapi/c/dev/ppb_file_chooser_dev.h"
 #include "ppapi/c/dev/ppb_file_system_dev.h"
 #include "ppapi/c/dev/ppb_graphics_3d_dev.h"
@@ skipping 13 matching lines @@
 namespace ppapi {
 namespace thunk {
 
 // A functional API for creating resource types. Separating out the creation
 // functions here allows us to implement most resources as a pure "resource
 // API", meaning all calls are routed on a per-resource-object basis. The
 // creation functions are not per-object (since there's no object during
 // creation) so need functional routing based on the instance ID.
 class ResourceCreationAPI {
  public:
-  static const ::pp::proxy::InterfaceID interface_id =
-      ::pp::proxy::INTERFACE_ID_RESOURCE_CREATION;
+  virtual ~ResourceCreationAPI() {}
 
   virtual PP_Resource CreateAudio(PP_Instance instance,
                                   PP_Resource config_id,
                                   PPB_Audio_Callback audio_callback,
                                   void* user_data) = 0;
   virtual PP_Resource CreateAudioTrusted(PP_Instance instace) = 0;
   virtual PP_Resource CreateAudioConfig(PP_Instance instance,
                                         PP_AudioSampleRate sample_rate,
                                         uint32_t sample_frame_count) = 0;
   virtual PP_Resource CreateBroker(PP_Instance instance) = 0;
@@ skipping 39 matching lines @@
                                       PP_Config3D_Dev config,
                                       const int32_t* attrib_list) = 0;
   virtual PP_Resource CreateTransport(PP_Instance instance,
                                       const char* name,
                                       const char* proto) = 0;
   virtual PP_Resource CreateURLLoader(PP_Instance instance) = 0;
   virtual PP_Resource CreateURLRequestInfo(PP_Instance instance) = 0;
   virtual PP_Resource CreateVideoDecoder(PP_Instance instance) = 0;
   virtual PP_Resource CreateVideoLayer(PP_Instance instance,
                                        PP_VideoLayerMode_Dev mode) = 0;
+
+  static const ::pp::proxy::InterfaceID interface_id =
+      ::pp::proxy::INTERFACE_ID_RESOURCE_CREATION;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_RESOURCE_CREATION_API_H_