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This reverts commit 20f64257.

Reason for revert: Suspected of breaking device_unittests on Win10 Tests x64 (dbg)

Original change's description:
> [Bluetooth][WinRT] Implement Obtaining Gatt Descriptors
> 
> This change implements obtainining Remote Gatt Descriptors for WinRT by
> hooking up the appropriate logic into GattDiscovererWinrt. Furthermore,
> appropriate tests are enabled.
> 
> Bug: 821766
> Change-Id: I20475478367c2ab6b18940b4271de70ec138f676
> Reviewed-on: https://chromium-review.googlesource.com/1156392
> Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
> Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
> Reviewed-by: Reilly Grant <reillyg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#579830}

TBR=reillyg@chromium.org,ortuno@chromium.org,jdoerrie@chromium.org

Change-Id: If5128ebf0c9dd1f585bd98b9729a57340f4493a0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 821766, 870208
Reviewed-on: https://chromium-review.googlesource.com/1159943Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580106}