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

device/bluetooth/bluetooth_adapter_mac_unittest.mm

 // Copyright 2013 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 "base/memory/ref_counted.h"
 #include "base/test/test_simple_task_runner.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_adapter_mac.h"
 #include "device/bluetooth/bluetooth_discovery_session.h"
 #include "device/bluetooth/bluetooth_discovery_session_outcome.h"
@@ skipping 59 matching lines @@
     [[[mock_peripheral stub]
         andReturn:[[uuid_class performSelector:@selector(UUID)]
                       performSelector:@selector(initWithUUIDString:)
                            withObject:identifier]] identifier];
 
     return mock_peripheral;
   }
 
   NSDictionary* CreateAdvertisementData() {
     NSDictionary* advertisement_data = @{
-      @"CBAdvertisementDataIsConnectable" : @(YES),
-      @"CBAdvertisementDataServiceDataKey" : [NSDictionary dictionary],
+      CBAdvertisementDataIsConnectable : @(YES),
+      CBAdvertisementDataServiceDataKey : [NSDictionary dictionary],
     };
     [advertisement_data retain];
     return advertisement_data;
   }
 
   std::string GetHashAddress(CBPeripheral* peripheral) {
     return BluetoothLowEnergyDeviceMac::GetPeripheralHashAddress(peripheral);
   }
 
   void SetDeviceTimeGreaterThanTimeout(BluetoothLowEnergyDeviceMac* device) {
@@ skipping 223 matching lines @@
   EXPECT_EQ(1, NumDevices());
   EXPECT_TRUE(DevicePresent(mock_peripheral));
 
   // Check that object pointed to by |device| is deleted by the adapter.
   RemoveTimedOutDevices();
   EXPECT_EQ(0, NumDevices());
   EXPECT_FALSE(DevicePresent(mock_peripheral));
 }
 
 }  // namespace device