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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}