bluetooth: macOS: Remove c-style casting

device/bluetooth/bluetooth_adapter_mac_unittest.mm

Index: device/bluetooth/bluetooth_adapter_mac_unittest.mm
diff --git a/device/bluetooth/bluetooth_adapter_mac_unittest.mm b/device/bluetooth/bluetooth_adapter_mac_unittest.mm
index b330b3faf95e64f7aad86cc42dac1feeefd3f4f2..94a5d4e75b0be17fa0e47fcdfd2f4a78cd7108bb 100644
--- a/device/bluetooth/bluetooth_adapter_mac_unittest.mm
+++ b/device/bluetooth/bluetooth_adapter_mac_unittest.mm
@@ -100,7 +100,7 @@ class BluetoothAdapterMacTest : public testing::Test {
     mock_central_manager_.reset([[MockCentralManager alloc] init]);
     [mock_central_manager_ setState:desired_state];
     CBCentralManager* centralManager =
-        (CBCentralManager*)mock_central_manager_.get();
+        static_cast<CBCentralManager*>(mock_central_manager_.get());
     adapter_mac_->SetCentralManagerForTesting(centralManager);
     return true;
   }