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Iceberg builds .mpkgs, but Packages builds flat .pkgs. We switch to using
Packages because it can create "flag packages" that we can sign and 
signing is required for Mac OS X 10.8.

When we switched from .mpkg to .pkg, the keystone installer script was
not updated. So keystone installs are not happening.
Review URL: https://chromiumcodereview.appspot.com/10831041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148655 0039d316-1c4b-4281-b951-d872f2087c98