Update to NSS 3.15.5 and NSPR 4.10.3.

nspr/pr/src/md/unix/unix.c

Index: nspr/pr/src/md/unix/unix.c
===================================================================
--- nspr/pr/src/md/unix/unix.c	(revision 251855)
+++ nspr/pr/src/md/unix/unix.c	(working copy)
@@ -3614,14 +3614,9 @@
 {
     if (munmap(addr, len) == 0) {
         return PR_SUCCESS;
-    } else {
-    if (errno == EINVAL) {
-            PR_SetError(PR_INVALID_ARGUMENT_ERROR, errno);
-    } else {
-        PR_SetError(PR_UNKNOWN_ERROR, errno);
     }
-        return PR_FAILURE;
-    }
+    _PR_MD_MAP_DEFAULT_ERROR(errno);
+    return PR_FAILURE;
 }
 
 PRStatus _MD_CloseFileMap(PRFileMap *fmap)
@@ -3638,6 +3633,20 @@
     return PR_SUCCESS;
 }
 
+PRStatus _MD_SyncMemMap(
+    PRFileDesc *fd,
+    void *addr,
+    PRUint32 len)
+{
+    /* msync(..., MS_SYNC) alone is sufficient to flush modified data to disk
+     * synchronously. It is not necessary to call fsync. */
+    if (msync(addr, len, MS_SYNC) == 0) {
+        return PR_SUCCESS;
+    }
+    _PR_MD_MAP_DEFAULT_ERROR(errno);
+    return PR_FAILURE;
+}
+
 #if defined(_PR_NEED_FAKE_POLL)
 
 /*