bluetooth: Refactor GetDescriptorForUUID to GetDescriptorsForUUID.

device/bluetooth/test/bluetooth_test.h

Index: device/bluetooth/test/bluetooth_test.h
diff --git a/device/bluetooth/test/bluetooth_test.h b/device/bluetooth/test/bluetooth_test.h
index c840935138d6df9751380d3e75eb71ebccdfe27c..63fdec83c5e993e81d7f497bb4140496d75669cb 100644
--- a/device/bluetooth/test/bluetooth_test.h
+++ b/device/bluetooth/test/bluetooth_test.h
@@ -141,6 +141,11 @@ class BluetoothTestBase : public testing::Test {
   virtual void SimulateGattNotifySessionStarted(
       BluetoothGattCharacteristic* characteristic) {}
 
+  // Simulates a Characteristic Set Notify error.
+  virtual void SimulateGattNotifySessionStartError(
+      BluetoothGattCharacteristic* characteristic,
+      BluetoothGattService::GattErrorCode error_code) {}
+
   // Simulates a Characteristic Set Notify operation failing synchronously once
   // for an unknown reason.
   virtual void SimulateGattCharacteristicSetNotifyWillFailSynchronouslyOnce(