Fix bluetooth callback function declaration

device/bluetooth/bluetooth_low_energy_win.cc

Index: device/bluetooth/bluetooth_low_energy_win.cc
diff --git a/device/bluetooth/bluetooth_low_energy_win.cc b/device/bluetooth/bluetooth_low_energy_win.cc
index 77cfc225312f13a6495d468122675bdad817ff60..29abbad9eef86626b24e792fdd7cacd6d2078dbb 100644
--- a/device/bluetooth/bluetooth_low_energy_win.cc
+++ b/device/bluetooth/bluetooth_low_energy_win.cc
@@ -836,15 +836,20 @@ HRESULT BluetoothLowEnergyWrapper::RegisterGattEvents(
     base::FilePath& service_path,
     BTH_LE_GATT_EVENT_TYPE event_type,
     PVOID event_parameter,
-    PFNBLUETOOTH_GATT_EVENT_CALLBACK callback,
+    PFNBLUETOOTH_GATT_EVENT_CALLBACK_CORRECTED callback,
     PVOID context,
     BLUETOOTH_GATT_EVENT_HANDLE* out_handle) {
   base::File file(service_path, base::File::FLAG_OPEN | base::File::FLAG_READ);
   if (!file.IsValid())
     return HRESULT_FROM_WIN32(ERROR_OPEN_FAILED);
-  return BluetoothGATTRegisterEvent(file.GetPlatformFile(), event_type,
-                                    event_parameter, callback, context,
-                                    out_handle, BLUETOOTH_GATT_FLAG_NONE);
+  // Cast to the official callback type for compatibility with the Windows
+  // 10.0.10586 definition, even though it is incorrect. This cast can be
+  // removed when we mandate building Chromium with the 10.0.14393 SDK or
+  // higher.
+  return BluetoothGATTRegisterEvent(
+      file.GetPlatformFile(), event_type, event_parameter,
+      reinterpret_cast<PFNBLUETOOTH_GATT_EVENT_CALLBACK>(callback), context,
+      out_handle, BLUETOOTH_GATT_FLAG_NONE);
 }
 
 HRESULT BluetoothLowEnergyWrapper::UnregisterGattEvent(