Auto merge of #562 - servo:jdm-patch-28, r=jdm

Update mozjs.

None

Author: bors-servo

Cargo.toml

@@ -60,4 +60,4 @@ lazy_static = "1"
 libc = "0.2"
 log = "0.4"
 num-traits = "0.2"
-mozjs_sys = { git = "https://github.com/servo/mozjs", rev="4cd3f5b81f4c363c039631bf870e61a00c983f63" }
+mozjs_sys = { git = "https://github.com/servo/mozjs", rev="062d3dc473b66e2c4053b690ce1df45083351519" }