Adapt api.BluetoothRemoteGATTCharacteristic.characteristicvaluechanged to new events structure (#15065)
Adapt api.BluetoothRemoteGATTCharacteristic.characteristicvaluechanged to new events structure (#15065)

This PR adapts the characteristicvaluechanged event of the BluetoothRemoteGATTCharacteristic API to conform to the new events structure.
chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data