Refactor some ResourceMessageReply usages.

content/renderer/pepper/pepper_audio_input_host.h

Index: content/renderer/pepper/pepper_audio_input_host.h
diff --git a/content/renderer/pepper/pepper_audio_input_host.h b/content/renderer/pepper/pepper_audio_input_host.h
index 70c430329f920587e548c6c5cea96666ef746934..654008feb48c4ff496c4d9120bb2371503101d0f 100644
--- a/content/renderer/pepper/pepper_audio_input_host.h
+++ b/content/renderer/pepper/pepper_audio_input_host.h
@@ -61,10 +61,13 @@ class PepperAudioInputHost : public ppapi::host::ResourceHost {
 
   void Close();
 
+  void SendOpenReply(int32_t result);
+
   // Non-owning pointer.
   RendererPpapiHostImpl* renderer_ppapi_host_;
 
-  scoped_ptr<ppapi::host::ReplyMessageContext> open_context_;
+  ppapi::host::ReplyMessageContext open_context_;
+  bool open_pending_;
 
   // Audio input object that we delegate audio IPC through.
   // We don't own this pointer but are responsible for calling Shutdown on it.