Implement BluetoothGattNotifySession::Stop on Android, 2nd attempt
This change enables the stopNotifications function for remote GATT
characteristics on Android. In order to do so, two distinct refactorings have been done;
1) The session classes have been simplified so that platform specific versions are no longer required. All code that previously used BluetoothGattNotifySession[Mac|Win|BlueZ] now simply use the base BluetoothGattNotifySession class.
2) BluetoothRemoteGattCharacteristic::StartNotifySession and StopNotifySession have been rewritten so that all the code for keeping track of the different session objects and the notification state sits in the base class. Inheriting classes should no longer override these two functions, but instead override the much simpler SubscribeToNotifications and UnsubscribeFromNotifications.
BUG=584370
Committed: https://crrev.com/d41af3adfd8500c81c827ab03ed2736909cf1ee8
Review-Url: https://codereview.chromium.org/2051333004
Cr-Original-Commit-Position: refs/heads/master@{#412498}
Cr-Commit-Position: refs/heads/master@{#413417}
38 files changed
