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This removes the magic per-platform path filtering behavior. In
particular, it allows mojoms with "chromeos" in the path to be used
for non-chromeos build targets (e.g. lacros).

Bug: none
Change-Id: I98badef6971578b9e97194d16b06e79bacbab335
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253183
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Ken Rockot <rockot@google.com>
Auto-Submit: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780105}