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This change fixes GattServicesDiscovered on Windows to only be called
once all services, characteristics and descriptors are discovered.
Furthermore it removes the deprecated GattDiscoveryCompleteForService
notification.

Bug: 507419, 821766
Change-Id: I234409cb159a022e0443b8c2d2a4b1c90fac9b15
Reviewed-on: https://chromium-review.googlesource.com/850357Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Conley Owens <cco3@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545016}