Plumb MojoReplaceHandleWithReducedRights() out.

mojo/public/platform/nacl/libmojo.cc

Index: mojo/public/platform/nacl/libmojo.cc
diff --git a/mojo/public/platform/nacl/libmojo.cc b/mojo/public/platform/nacl/libmojo.cc
index c25aff218ce16960919c3d4157e747d35bbb7d49..81fb436175564bf89048aaf8d9c73204fd0d2e63 100644
--- a/mojo/public/platform/nacl/libmojo.cc
+++ b/mojo/public/platform/nacl/libmojo.cc
@@ -60,6 +60,16 @@ MojoResult MojoGetRights(MojoHandle handle, MojoHandleRights* rights) {
   return irt_mojo->MojoGetRights(handle, rights);
 }
 
+MojoResult MojoReplaceHandleWithReducedRights(MojoHandle handle,
+                                              MojoHandleRights rights_to_remove,
+                                              MojoHandle* replacement_handle) {
+  struct nacl_irt_mojo* irt_mojo = get_irt_mojo();
+  if (!irt_mojo)
+    abort();
+  return irt_mojo->MojoReplaceHandleWithReducedRights(handle, rights_to_remove,
+                                                      replacement_handle);
+}
+
 MojoResult MojoDuplicateHandleWithReducedRights(
     MojoHandle handle,
     MojoHandleRights rights_to_remove,