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This reverts commit 8fa7eced.

Reason for revert: HistogramManager.HistogramBucketFields crashes consistently on Win7 Tests (dbg):

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=cronet_unittests&tests=HistogramManager.HistogramBucketFields

First failing run:

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win7%20Tests%20%28dbg%29%281%29/68309

Original change's description:
> Enable Cronet tests on desktop platforms.
> 
> - Only initialize global state (e.g. AtExitManager) in non-Debug builds, so that our component-
>   build Debug bots can run cronet_tests.
> - Fix memory leaks in a number of unit-tests.
> - Disable some StaleHostResolver tests under ASAN, since they have leaks
>   that need resolving.
> 
> Bug: 812268, 816705, 829097
> Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
> Change-Id: I5084dd578682b2a8c128487c62de12e437e646f3
> Reviewed-on: https://chromium-review.googlesource.com/981787
> Commit-Queue: Wez <wez@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Reviewed-by: Misha Efimov <mef@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#548672}

TBR=wez@chromium.org,mef@chromium.org,jbudorick@chromium.org

Change-Id: Ic30729594ae2b1264702c7bb77c971d55e5e9ae9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 812268, 816705, 829097
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Reviewed-on: https://chromium-review.googlesource.com/999334Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548771}