GitLab

This puts all dependencies into a inner Delegate class so the test can
mock them out.

BUG=168080

Review URL: https://chromiumcodereview.appspot.com/17481002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207862 0039d316-1c4b-4281-b951-d872f2087c98