Update unit tests for BluetoothDevice::GetPrimaryServicesByUUID() etc.

device/bluetooth/bluetooth_device.cc

 // Copyright (c) 2012 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_device.h"
 
 #include <iterator>
 #include <memory>
 #include <string>
 
@@ skipping 472 matching lines @@
     }
   }
   return characteristics;
 }
 
 std::vector<device::BluetoothRemoteGattDescriptor*>
 BluetoothDevice::GetDescriptorsByUUID(
     device::BluetoothRemoteGattCharacteristic* characteristic,
     const BluetoothUUID& descriptor_uuid) {
   std::vector<device::BluetoothRemoteGattDescriptor*> descriptors;
-  DVLOG(1) << "Looking for descriptor: " << descriptor_uuid.canonical_value();
-  for (auto* descriptor : characteristic->GetDescriptors()) {
-    DVLOG(1) << "Descriptor in cache: "
-             << descriptor->GetUUID().canonical_value();
-    if (descriptor->GetUUID() == descriptor_uuid) {
-      descriptors.push_back(descriptor);
+  if (characteristic) {
+    DVLOG(1) << "Looking for descriptor: " << descriptor_uuid.canonical_value();
+    for (auto* descriptor : characteristic->GetDescriptors()) {
+      DVLOG(1) << "Descriptor in cache: "
+               << descriptor->GetUUID().canonical_value();
+      if (descriptor->GetUUID() == descriptor_uuid) {
+        descriptors.push_back(descriptor);
+      }
     }
   }
   return descriptors;
 }
 
 void BluetoothDevice::DidConnectGatt() {
   for (const auto& callback : create_gatt_connection_success_callbacks_) {
     callback.Run(
         base::MakeUnique<BluetoothGattConnection>(adapter_, GetAddress()));
   }
@@ skipping 69 matching lines @@
   if (power < INT8_MIN) {
     return INT8_MIN;
   }
   if (power > INT8_MAX) {
     return INT8_MAX;
   }
   return static_cast<int8_t>(power);
 }
 
 }  // namespace device