Remove TODOs that are out of date.

device/bluetooth/bluetooth_remote_gatt_characteristic_android.h

Index: device/bluetooth/bluetooth_remote_gatt_characteristic_android.h
diff --git a/device/bluetooth/bluetooth_remote_gatt_characteristic_android.h b/device/bluetooth/bluetooth_remote_gatt_characteristic_android.h
index c0606b420c7ae2c6bf6adffeda5d320bd660faa4..ab0f081d0bbcd4d5e19bedcbceee65c165b4b9d2 100644
--- a/device/bluetooth/bluetooth_remote_gatt_characteristic_android.h
+++ b/device/bluetooth/bluetooth_remote_gatt_characteristic_android.h
@@ -24,9 +24,6 @@ class BluetoothRemoteGattServiceAndroid;
 // BluetoothRemoteGattCharacteristicAndroid along with its owned Java class
 // org.chromium.device.bluetooth.ChromeBluetoothRemoteGattCharacteristic
 // implement BluetootGattCharacteristic.
-//
-// TODO(crbug.com/551634): When notifications are enabled characteristic updates
-// should call observers' GattCharacteristicValueChanged.
 class DEVICE_BLUETOOTH_EXPORT BluetoothRemoteGattCharacteristicAndroid
     : public BluetoothRemoteGattCharacteristic {
  public:
@@ -138,6 +135,7 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothRemoteGattCharacteristicAndroid
   bool write_pending_ = false;
   base::Closure write_callback_;
   ErrorCallback write_error_callback_;
+  std::vector<uint8_t> write_value_;
 
   std::vector<uint8_t> value_;