chrome_set_ver: Add symlink to chromite_wrapper for new tool

BUG=none
TEST=run it
Review URL: http://codereview.chromium.org/7605017

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@96223 0039d316-1c4b-4281-b951-d872f2087c98

chrome_set_ver

+chromite_wrapper
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