bluetooth: Refactor GetDescriptorForUUID to GetDescriptorsForUUID.

device/bluetooth/bluetooth_gatt_characteristic.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/bluetooth/bluetooth_gatt_characteristic.h"
 
 #include "base/logging.h"
 #include "device/bluetooth/bluetooth_gatt_descriptor.h"
 
 namespace device {
 
 BluetoothGattCharacteristic::BluetoothGattCharacteristic() {
 }
 
 BluetoothGattCharacteristic::~BluetoothGattCharacteristic() {
 }
 
 // static
 BluetoothGattCharacteristic* BluetoothGattCharacteristic::Create(
     const BluetoothUUID& uuid,
     const std::vector<uint8_t>& value,
     Properties properties,
     Permissions permissions) {
   LOG(ERROR) << "Creating local GATT characteristics currently not supported.";
   return NULL;
 }
 
-BluetoothGattDescriptor* BluetoothGattCharacteristic::GetDescriptorForUUID(
-    const BluetoothUUID& uuid) {
+std::vector<BluetoothGattDescriptor*>
+BluetoothGattCharacteristic::GetDescriptorsForUUID(const BluetoothUUID& uuid) {
+  std::vector<BluetoothGattDescriptor*> descriptors;
   for (BluetoothGattDescriptor* descriptor : GetDescriptors()) {
     if (descriptor->GetUUID() == uuid) {
-      return descriptor;
+      descriptors.push_back(descriptor);
     }
   }
-  return NULL;
+  return descriptors;
 }
 
 }  // namespace device