GitLab

Remove deprecated_default_sources_assignment_filter and replace
it with explicit is_win, is_mac, etc. sections.

Bug: 1018739
Change-Id: I3befa68bf2f1091392fa46dec43660638189f637
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443250
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813210}