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After crrev.com/c/1242296, we no longer need to proxy browser initiated
requests with webRequest. This cleans up the proxy for the
URLLoaderFactory used for browser initiated requests.

Bug: 888672
Change-Id: I96c55fa5849285ae8f86c4b6d7c24d47c8ac4c19
Reviewed-on: https://chromium-review.googlesource.com/c/1254725
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596324}