GitLab

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

Bug: 1018739
Change-Id: Ided224b9b9eb717dd63589500816322af1574e23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443014Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813145}