Snap for 9560500 from 471e7f664cc93f4312c3c5beba482228eda12e34 to sdk-release

Change-Id: I648a9315bedd920ade158a04bf15c4b34dda68cd
diff --git a/build/sandbox/nsjail.cfg b/build/sandbox/nsjail.cfg
index 509ecc6..5341577 100644
--- a/build/sandbox/nsjail.cfg
+++ b/build/sandbox/nsjail.cfg
@@ -154,3 +154,10 @@
   dst: "/dev/zero"
   is_bind: true
 }
+
+# /dev/stdin used during the creation files in external/cronet
+mount {
+  src: "/proc/self/fd/0"
+  dst: "/dev/stdin"
+  is_symlink: true
+}