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This reverts commit e1c22cc3.

Reason for revert:
Compile failure on Windows https://ci.chromium.org/buildbot/chromium/Win%20x64/18699

Original change's description:
> Move url_loader_unittest.cc and network_service_unittest.cc to services/network.
> 
> Their content dependencies have been removed in previous changes.
> 
> Bug: 753658
> Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
> Change-Id: Ic632759ef35cfef4e707d29acdc361ae836e9b62
> Reviewed-on: https://chromium-review.googlesource.com/893651
> Commit-Queue: John Abd-El-Malek <jam@chromium.org>
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Reviewed-by: Ken Rockot <rockot@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#533113}

TBR=jam@chromium.org,rockot@chromium.org,tsepez@chromium.org

Change-Id: Id179d007751f72c0813162ed0995232b033e74a0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 753658
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/894710Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533140}