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This CL removes hardcoded, path-based exclusions from the rewriter's
source code and moves them into a filter file.  This way, the exclusions
can be updated (or experimented with) without having to recompile the
rewriter.

Bug: 1069567
Change-Id: I7f0151fb8fdeb595da44e44c063caef0c154c31b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337393
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796254}