Pepper: Report NaCl exit status over Chromium IPC.

ppapi/api/private/ppb_nacl_private.idl

Index: ppapi/api/private/ppb_nacl_private.idl
diff --git a/ppapi/api/private/ppb_nacl_private.idl b/ppapi/api/private/ppb_nacl_private.idl
index 8d9038c36c1e404af2b3628c6e628e8701a863aa..cb5cc4e06a55f87208e8f1fa871fbdb67293ca87 100644
--- a/ppapi/api/private/ppb_nacl_private.idl
+++ b/ppapi/api/private/ppb_nacl_private.idl
@@ -301,13 +301,6 @@ interface PPB_NaCl_Private {
   /* Returns the NaCl readiness status for this instance. */
   PP_NaClReadyState GetNaClReadyState([in] PP_Instance instance);
 
-  /* Returns the exit status of the plugin process. */
-  int32_t GetExitStatus([in] PP_Instance instance);
-
-  /* Sets the exit status of the plugin process. */
-  void SetExitStatus([in] PP_Instance instance,
-                     [in] int32_t exit_status);
-
   /* Logs the message via VLOG. */
   void Vlog([in] str_t message);