Mac: Make ScopedTypeRef require explicit constructors

device/bluetooth/test/bluetooth_test_mac.mm

Index: device/bluetooth/test/bluetooth_test_mac.mm
diff --git a/device/bluetooth/test/bluetooth_test_mac.mm b/device/bluetooth/test/bluetooth_test_mac.mm
index 73527a2bbafe639696dab33a984c6f43d2ece5e2..cc4b8d85f108e4324b61616c904472b36a309f8d 100644
--- a/device/bluetooth/test/bluetooth_test_mac.mm
+++ b/device/bluetooth/test/bluetooth_test_mac.mm
@@ -41,18 +41,20 @@ explicit ScopedMockCentralManager(MockCentralManager* mock_central_manager) {
 
 namespace {
 
-NSDictionary* CreateAdvertisementData(NSString* name, NSArray* uuids) {
-  NSMutableDictionary* advertisement_data =
+scoped_nsobject<NSDictionary> CreateAdvertisementData(NSString* name,
+                                                      NSArray* uuids) {
+  NSMutableDictionary* advertisement_data(
       [NSMutableDictionary dictionaryWithDictionary:@{
         CBAdvertisementDataLocalNameKey : name,
         CBAdvertisementDataServiceDataKey : @{},
         CBAdvertisementDataIsConnectable : @(YES),
-      }];
+      }]);
   if (uuids) {
     [advertisement_data setObject:uuids
                            forKey:CBAdvertisementDataServiceUUIDsKey];
   }
-  return [advertisement_data retain];
+  return scoped_nsobject<NSDictionary>(advertisement_data,
+                                       base::scoped_policy::RETAIN);
 }
 
 }  // namespace
@@ -229,7 +231,7 @@ explicit ScopedMockCentralManager(MockCentralManager* mock_central_manager) {
       static_cast<BluetoothLowEnergyDeviceMac*>(device);
   CBPeripheral* peripheral = device_mac->GetPeripheral();
   MockCBPeripheral* peripheral_mock = ObjCCast<MockCBPeripheral>(peripheral);
-  scoped_nsobject<NSMutableArray> services = [[NSMutableArray alloc] init];
+  scoped_nsobject<NSMutableArray> services([[NSMutableArray alloc] init]);
   for (auto uuid : uuids) {
     CBUUID* cb_service_uuid = [CBUUID UUIDWithString:@(uuid.c_str())];
     [services addObject:cb_service_uuid];