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This is not longer being used.  It had been used by AppCache and the
Data Reduction Proxy, neither of which hook directly into net anymore.

Bug: 934009
Change-Id: I9351b2bc889fa4474f3ac91bf7f7041b4ae6d092
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790489
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695431}