GitLab

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

Bug: 1018739
Change-Id: Ic2936815867eb60aae58f59e1b6ff229ebd8e112
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443134
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813147}