Defer checking whether unencrypted sync is enabled until we are well
past profile initialization.
R=dougw@chromium.org
BUG=308813

Review URL: https://codereview.chromium.org/29643002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229468 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229468