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This caused a regression on Cronet perf tests.  I'll reland with some windows-only ifdefs.  Sadly, our infrastructure makes it easier to revert and reland with modifications than to land another CL, if you have a lot of local branches.

This reverts commit ac0c504b.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Add URLRequest creation stack traces to AssertNoURLRequests crashes.
> 
> We have a top crasher here (Again...), and need to figure out just
> what's going on. Hopefully once we ship the network service, we'll
> never see these crashes again (Well, at least in the network
> process).
> 
> Bug: 800391
> Change-Id: Ifbd45274ac73ca90c7103aea66ba0f7d254c9e6e
> Reviewed-on: https://chromium-review.googlesource.com/916894
> Reviewed-by: Eric Roman <eroman@chromium.org>
> Commit-Queue: Matt Menke <mmenke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#536575}

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

Change-Id: Id648cff17e81452d0203b13d1b4b00a49976a6b8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 800391
Reviewed-on: https://chromium-review.googlesource.com/919401Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536739}