NaCl: enable meta-based validation for shared libraries.

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 b1f47ce76f5f94a64de6044bc4281bc091b8ab17..049387a138f7f0e84626b01baa842194c21c7eae 100644
--- a/ppapi/api/private/ppb_nacl_private.idl
+++ b/ppapi/api/private/ppb_nacl_private.idl
@@ -34,12 +34,6 @@ enum PP_NaClError {
   PP_NACL_MANIFEST_MISSING_ARCH = 0
 };
 
-struct PP_NaClExecutableMetadata {
-  /** File path of NaCl executable. This is created by the OpenNaClExecutableFd
-   *  function. It is the caller's responsiblity to release it. */
-  PP_Var file_path;
-};
-
 /* PPB_NaCl_Private */
 interface PPB_NaCl_Private {
   /* Launches NaCl's sel_ldr process.  Returns PP_NACL_OK on success and
@@ -129,5 +123,5 @@ interface PPB_NaCl_Private {
    */
   PP_FileHandle OpenNaClExecutable([in] PP_Instance instance,
                                    [in] str_t file_url,
-                                   [out] PP_NaClExecutableMetadata metadata);
+                                   [out] uint64_t nonce);
 };