posix: restore permissions on incorrectly-permissioned user data dirs.
posix: restore permissions on incorrectly-permissioned user data dirs.

We can remove this in a month or two.

BUG=11776
TEST=Remove your ~/.config/chromium.  ls -ld ~/.config/chromium should be drwx------.  chmod ~/.config/chromium og+rwx and restart.  It should regain the above permissions.

Review URL: http://codereview.chromium.org/115257

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@15893 0039d316-1c4b-4281-b951-d872f2087c98

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