bluetooth: mac: Fix incorrect use of AdvertisementData dictionary strings.

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 34a2d2ef6a3fd4d5f89d1cda5a24d9adc50f595e..6329dd02109f9c4e7289ed7d9e98af87b9b9b97e 100644
--- a/device/bluetooth/bluetooth_adapter_mac_unittest.mm
+++ b/device/bluetooth/bluetooth_adapter_mac_unittest.mm
@@ -77,8 +77,8 @@ class BluetoothAdapterMacTest : public testing::Test {
 
   NSDictionary* CreateAdvertisementData() {
     NSDictionary* advertisement_data = @{
-      @"CBAdvertisementDataIsConnectable" : @(YES),
-      @"CBAdvertisementDataServiceDataKey" : [NSDictionary dictionary],
+      CBAdvertisementDataIsConnectable : @(YES),
+      CBAdvertisementDataServiceDataKey : [NSDictionary dictionary],
     };
     [advertisement_data retain];
     return advertisement_data;