Run the GDM Xsession script instead of /etc/X11/Xsession.
Run the GDM Xsession script instead of /etc/X11/Xsession.

This causes ~/.profile to be sourced in a Virtual Me2Me session, which the
other Xsession script didn't seem to be doing.

BUG=110825
TEST=Manual

Review URL: https://chromiumcodereview.appspot.com/9192034

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@118536 0039d316-1c4b-4281-b951-d872f2087c98

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