Allow GCF installation on machine with old IE 7 installs.
Allow GCF installation on machine with old IE 7 installs.

BUG=105386
TEST=install on Vista RTM (IE 7.0.6000.16386).  if it fails, the fix doesn't work.
R=robertshield@chromium.org

Review URL: http://codereview.chromium.org/8702010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@111605 0039d316-1c4b-4281-b951-d872f2087c98

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