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Similarly to r574552 this change moves the map of descriptors from the
platform implementations to the BluetoothRemoteGattCharacteristic base
class. In addition, default implementations for GetDescriptor() and
GetDescriptors() are provided. Lastly, this change cleans up a few lint
errors, mostly missing includes.

Bug: 821766
Change-Id: Iada71c198d241acf3bddcc1414ff89aa150c1c84
Reviewed-on: https://chromium-review.googlesource.com/1136296Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575603}