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The Common Debian Build System (cdbs) is needed for
packaging .deb files in some configurations.

http://packages.ubuntu.com/search?keywords=cdbs
shows that it's available for all common Ubuntu
distributions.
On Precise and Trusty, the package is very small (~40kB),
so it shouldn't have much impact on users.

TESTED=ran install-build-deps.sh on Ubuntu Precise.
R=friedman@chromium.org

Review URL: https://codereview.chromium.org/531513002

Cr-Commit-Position: refs/heads/master@{#295674}