Add a FIXME explaining PageGroup's lack of utility
Add a FIXME explaining PageGroup's lack of utility

R=abarth@chromium.org
BUG=299834

Review URL: https://codereview.chromium.org/115333005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@163924 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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