Using the GATT connection address instead of cached remote_device().

components/proximity_auth/ble/bluetooth_low_energy_connection.cc

Index: components/proximity_auth/ble/bluetooth_low_energy_connection.cc
diff --git a/components/proximity_auth/ble/bluetooth_low_energy_connection.cc b/components/proximity_auth/ble/bluetooth_low_energy_connection.cc
index 8878585426e84b3919f8b64e260ed5b9b6f94fc9..e1e6209963077371042fc9ed55a01330106f248e 100644
--- a/components/proximity_auth/ble/bluetooth_low_energy_connection.cc
+++ b/components/proximity_auth/ble/bluetooth_low_energy_connection.cc
@@ -550,8 +550,13 @@ void BluetoothLowEnergyConnection::ClearWriteRequestsQueue() {
     write_requests_queue_.pop();
 }
 
-const std::string& BluetoothLowEnergyConnection::GetRemoteDeviceAddress() {
-  return remote_device().bluetooth_address;
+std::string BluetoothLowEnergyConnection::GetRemoteDeviceAddress() {
+  // When the remote device is connected we should rely on the address given by
+  // |gatt_connection_|. As the device address may change if the device is
+  // paired. The address in |gatt_connection_| is automatically updated in this
+  // case.
+  return gatt_connection_ ? gatt_connection_->GetDeviceAddress()
+                          : remote_device().bluetooth_address;
 }
 
 BluetoothDevice* BluetoothLowEnergyConnection::GetRemoteDevice() {