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This tool stopped working when comments ({#..#}) were added to the
manifest Jinja templates.

Change-Id: I54a0fce1907b55671787a9dd57f62d2f2e958d2e
Reviewed-on: https://chromium-review.googlesource.com/c/1459062
Auto-Submit: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630072}