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This reduces the unnecessary NetLog spam, since we would log to the NetLog everytime we created the backup ConnectJob, even though we usually wouldn't actually call Connect() on it.  Now, we only create the backup ConnectJob when we intend to call Connect() on it.
Includes some various cleanup necessary for this:
  * struct Group => class Group
  * method_factory moves from CSP to Group

Review URL: http://codereview.chromium.org/3171017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57100 0039d316-1c4b-4281-b951-d872f2087c98