GitLab

1. Store list information in ListInfo (was: StoreIdAndFIleName). This includes the list identifier, list filename on disk, the SBThreatType for the list, and whether to fetch updates for this list.

2. Fixed potential leaks by inserting the client into pending_clients_ before calling GetFullHashes
(based on shess@'s feedback in 2349603003)

BUG=543161, 608075

Review-Url: https://codereview.chromium.org/2353413002
Cr-Commit-Position: refs/heads/master@{#420515}