Migrate har_importer/ to import cross-module
Migrate har_importer/ to import cross-module

Bug: 1006759
Change-Id: Ie62ad3b437a4bd9d475b62911995c9d64a5703e4
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2019133
Reviewed-by: Paul Lewis <8915f5d5c39a08c5a3e8a8d7314756e4580816f9@chromium.org>
Commit-Queue: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>

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