GitLab

- Tightening access to ServerConnectionManager members
- Removing redindant functions in url_translator
- raw pointer => unique_ptr in commit.h
- Iterators => range-based loop in ProcessDownloadedUpdates

BUG=
R=pnoland@chromium.org

Change-Id: I11775719ee08d901bc2568e8298af396f417b751
Reviewed-on: https://chromium-review.googlesource.com/565650Reviewed-by: Patrick Noland <pnoland@chromium.org>
Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485402}