Recent version of ubuntu such as trusty and saucy
and have a newer version of schroot.  The change
teaches install-chroot.sh about the differences.

Also, remove --no-lib32 argument to install-build-deps
which no longer exists (means this script has been
broken for quite a while now).

TEST=install precise32bit chroot and build chrome within it
BUG=410101

Review URL: https://codereview.chromium.org/1173713002

Cr-Commit-Position: refs/heads/master@{#336594}