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r652224 added initial support for removing headers through the Declarative Net
Request API. This CL fixes an existing TODO by preventing web request extensions
from adding back headers removed by DNR.

BUG=947591

Change-Id: I8a6eb4bd3ae8d9bdd556feefb454cbd30944aa74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1565613
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Auto-Submit: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652646}