Update README.chromium to reflect recent NDK/SDK changes.

BUG=599327

Change-Id: I6b6cc8da462dba0c52bb91828938796231a8ffaa
Reviewed-on: https://chromium-review.googlesource.com/392806
Reviewed-by: John Budorick <jbudorick@chromium.org>
Tested-by: John Budorick <jbudorick@chromium.org>
1 file changed