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This reverts commit 674a1af2.

Reason for revert: suspected cause of crbug.com/1146687

Original change's description:
> Refactor subresource redirect renderer code
>
> This CL refactors the existing subresource redirect code to make the
> robots rules and login based image compression implementation easy.
>
> * Separate out the url loader throttle that does redirect and timeout
> handling from the public image hints decider logic. The robots decider can
> be subclassed and used.
>
> * Make public image hints agent as renderframeobserver. This reduces
> cluttter in ResourceLoadingHintsAgent. The upcoming robots checker agent
> could also observe renderframeobserver directly.
>
> No change in behavior is expected.
>
> Change-Id: Ic555a4402016a645b8820fa87dd5157c7112fb71
> Bug: 1144836
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514068
> Commit-Queue: rajendrant <rajendrant@chromium.org>
> Reviewed-by: Michael Crouse <mcrouse@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#825115}

TBR=rajendrant@chromium.org,mcrouse@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1144836, 1146687
Change-Id: I483882b29ac342d188137690e7ba9f8cbedcd6ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527859Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825966}