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set_sources_assignment_filter() is considered as a mis-feature
of gn (as it makes it difficult to reason about the BUILD.gn
files individually).

Convert BUILD.gn files below //base to instead use conditional
to include source files only on the platformn where they are
used.

The conversion was done by using a modified version of gn that
display all files filtered by set_sources_assignment_filter()
and updating the BUILD.gn files manually to explicitly add the
source files only on the platform that used them.

Bug: 1018739
Change-Id: I236542d7b8e2b5cba5b633b37791d1f1dbbe8d2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879458
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710890}