PPAPI: Remove unused PPBAudio_NotifyAudioStreamCreated_Params

ppapi/proxy/serialized_structs.h

Index: ppapi/proxy/serialized_structs.h
diff --git a/ppapi/proxy/serialized_structs.h b/ppapi/proxy/serialized_structs.h
index f1d90f21a2b936837a4217b6fc25c03b18da50de..6bb0da0df9268b0dc935088ba318dd9c2d9d81b9 100644
--- a/ppapi/proxy/serialized_structs.h
+++ b/ppapi/proxy/serialized_structs.h
@@ -86,14 +86,6 @@ struct PPBFlash_DrawGlyphs_Params {
   std::vector<PP_Point> glyph_advances;
 };
 
-struct PPBAudio_NotifyAudioStreamCreated_Params {
-  ppapi::HostResource audio_id;
-  int32_t result_code;  // Will be != PP_OK on failure
-  IPC::PlatformFileForTransit socket_handle;
-  base::SharedMemoryHandle handle;
-  int32_t length;
-};
-
 struct PPBURLLoader_UpdateProgress_Params {
   PP_Instance instance;
   ppapi::HostResource resource;