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It doesn't check that the integer version was actually added
to leveldb though, which is unfortunate.  It ensures that
opening a v0 database doesn't fail an assert, which is what
would happen if you opened an unmigrated database with code
that expects to find a stored integer version.

BUG=108223

Review URL: https://chromiumcodereview.appspot.com/10826159

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150458 0039d316-1c4b-4281-b951-d872f2087c98