Linux: Update install-build-deps.sh for Natty and remove pre-Lucid support.
Linux: Update install-build-deps.sh for Natty and remove pre-Lucid support.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/6990006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@86107 0039d316-1c4b-4281-b951-d872f2087c98

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