Apparmor stopping Google Chrome from launching in guest session

As mentioned in comment 5 of bug #1298021, it seems that Google have modified how they package Chrome in their repository.

Based on the fix for that bug, it appears that Chrome was packaged as /opt/google/chrome-stable/google-chrome-stable, /opt/google/chrome-beta/google-chrome-beta or /opt/google/chrome-unstable/google-chrome-unstable based on the package version. The current stable package, google-chrome-stable version 36.0.1985.143-1, from the repository at http://dl.google.com/linux/chrome/deb/installs the binary as /opt/google/chrome/google-chrome, which doesn't match any of the rules added to Apparmor.

Adding the following additional line caused the browser to work in guest mode for me:

  /opt/google/chrome/google-chrome Cx -> chromium,

$ lsb_release -rd
Description: Ubuntu 14.04.1 LTS
Release: 14.04

$ apt-cache policy lightdm
lightdm:
  Installed: 1.10.1-0ubuntu1
  Candidate: 1.10.1-0ubuntu1
  Version table:
 *** 1.10.1-0ubuntu1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.10.0-0ubuntu3 0
        500 http://gb.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages