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This reverts commit 24e730d2.

Reason for revert: The delay navigation throttle will ruin data here.
Let me re-land tomorrow.

Original change's description:
> Predictor: Dispatch all predictions async from the resource throttle
> 
> This is a small refactor that should have some performance wins. Now
> that PlzNavigate has launched, we should be dispatching our preconnects
> after the initial navigation request has gone out, not before. This is
> because frequently (especially on Android), dispatching preconnects
> tends to hog the IO thread, delaying the initial request.
> 
> Note that this predictor is probably going away, but this CPU work
> is in the critical path of some other work I am planning on tackling.
> 
> Bug: 792524
> Change-Id: I87e3c235be0480d766e3e45c9a97c4a26b15f60d
> Reviewed-on: https://chromium-review.googlesource.com/821090
> Commit-Queue: Charlie Harrison <csharrison@chromium.org>
> Reviewed-by: Matt Menke <mmenke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#523473}

TBR=mmenke@chromium.org,csharrison@chromium.org

Change-Id: I596b40d4d3f527de7e0df6c00f376281a2dbe381
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 792524
Reviewed-on: https://chromium-review.googlesource.com/823110Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523486}