Fix obsolete javadoc.

"user.home" and "java.io.tmpdir" are modifiable for backward
compatibility.

bug: 18587205

(cherry picked from commit 461f38f918a39a3747fd2f72393cc29a45232b1d)

Change-Id: I708515cf8b139645c26051105de3ba556f0da7a0
1 file changed