GitLab

Reworks DepsIterator so it is compatible with STL iterators enough to work with range-based for loops. The iterator is now created by a target rather than taking a target as an argument, which makes the loops more natural.

I also changed some loops around code I was touching to use range-based.

Review URL: https://codereview.chromium.org/610043002

Cr-Commit-Position: refs/heads/master@{#297122}