Dependencies are processed in order, so they don't have to be sorted.
target_os for each dependency is a set [1], so it should be sorted to avoid flaky failures.

[1] https://cs.chromium.org/chromium/tools/depot_tools/gclient.py?l=368

Bug: 984182
Change-Id: I3e84f3cb85f9cb1920b7abf7a45766f3a518f4c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1789278
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@google.com>
Reviewed-by: Andrii Shyshkalov <tandrii@google.com>