Allow device/bluetooth to build on the macOS 10.13 SDK

device/bluetooth/bluetooth_adapter_mac.h

 // 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.
 
 #ifndef DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_MAC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_MAC_H_
 
 #include <IOKit/IOReturn.h>
 
 #include <memory>
@@ skipping 11 matching lines @@
 #include "device/bluetooth/bluetooth_export.h"
 #include "device/bluetooth/bluetooth_low_energy_device_mac.h"
 #include "device/bluetooth/bluetooth_low_energy_discovery_manager_mac.h"
 #include "device/bluetooth/bluetooth_uuid.h"
 
 @class CBUUID;
 @class IOBluetoothDevice;
 @class NSArray;
 @class NSDate;
 
+#if !defined(MAC_OS_X_VERSION_10_13)
+
+// The 10.13 SDK deprecates the CBCentralManagerState enum. When building
+// against older SDKs, define the new enum in terms of the deprecated one.
+using CBManagerState = CBCentralManagerState;
+constexpr CBManagerState CBManagerStateUnknown = CBCentralManagerStateUnknown;
+constexpr CBManagerState CBManagerStateResetting =
+    CBCentralManagerStateResetting;
+constexpr CBManagerState CBManagerStateUnsupported =
+    CBCentralManagerStateUnsupported;
+constexpr CBManagerState CBManagerStateUnauthorized =
+    CBCentralManagerStateUnauthorized;
+constexpr CBManagerState CBManagerStatePoweredOff =
+    CBCentralManagerStatePoweredOff;
+constexpr CBManagerState CBManagerStatePoweredOn =
+    CBCentralManagerStatePoweredOn;
+
+#endif  // MAC_OS_X_VERSION_10_13
+
 namespace base {
 
 class SequencedTaskRunner;
 
 }  // namespace base
 
 @class BluetoothLowEnergyCentralManagerDelegate;
 
 namespace device {
 
@@ skipping 186 matching lines @@
   scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
 
   base::WeakPtrFactory<BluetoothAdapterMac> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothAdapterMac);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_MAC_H_