build: Remove no-op calls to set_sources_assignment_filter
build: Remove no-op calls to set_sources_assignment_filter

Chromiun no longer use set_sources_assignment_filter() anywhere in the
build, so these are no longer needed.

Bug: chromium:1018739
Change-Id: Ie81fa6fa9688e03a81a9aa2d2a58a7ae50914394
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto