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This is a reland of 574add02

Added DevToolsFrontendInWebRequestApiTest.HiddenRequests to the filter
file, will fix it in a follow up.

Original change's description:
> Reset URLLoaderFactory bindings for web request proxy
>
> Previously, if a request was made before any web request listeners or
> rules were added, the URLLoaderFactory would not be proxied through the
> browser process to run the WebRequest code. Now, if it is detected that
> WebRequest listeners/rules are added, we reset the bindings so they will
> be recreated and proxied through the browser process.
>
> Observers were added for a few classes so WebRequestAPI can listen to
> rule changes.
>
> Changes in URLLoaderFactoryGetter were needed due to crbug.com/613371.
>
> Bug: 857577
> Cq-Include-Trybots: luci.chromium.try:linux_mojo
> Change-Id: I7805be86512545b496e30b9693374981fdc2633e
> Reviewed-on: https://chromium-review.googlesource.com/1139048
> Commit-Queue: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: Ken Rockot <rockot@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#577036}

TBR=rockot@chromium.org,kinuko@chromium.org

Bug: 857577
Change-Id: I83f266cfcd572ccbde36405d7cff501f92122b2d
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/1147042Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577310}