Remove the old "SecureRandom" service, formerly used by get_random_bytes()

src/trusted/desc/nacl_desc_wrapper.h

Index: src/trusted/desc/nacl_desc_wrapper.h
diff --git a/src/trusted/desc/nacl_desc_wrapper.h b/src/trusted/desc/nacl_desc_wrapper.h
index 78bdde697663e22f18d1927bd0c9fc8427aee0ce..d412075cdad79aea16caf0e10a92492dbbee4226 100644
--- a/src/trusted/desc/nacl_desc_wrapper.h
+++ b/src/trusted/desc/nacl_desc_wrapper.h
@@ -37,8 +37,6 @@ class DescWrapperFactory {
   // As with OpenHostFile, but with quota management.
   DescWrapper* OpenHostFileQuota(const char* fname, int flags, int mode,
                                  const uint8_t* file_id);
-  // Create a DescWrapper for a random number generator.
-  DescWrapper* OpenRng();
   // Create a DescWrapper for the designated invalid descriptor
   DescWrapper* MakeInvalid();