Don't post tasks from RulesRegistry c-tor

Because RR is refcounted, it is a bad idea to put |this| into temporary scoped_refptr during construction.

The first patchset here only contains a whitespace change to make sure the use-after-free is reproducible on the trybots.

BUG=328051

Review URL: https://codereview.chromium.org/108193008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241831 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241831