Style: Replace header guards with #pragma once

core/io/resource.h

@@ -28,8 +28,7 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
 /**************************************************************************/
 
-#ifndef RESOURCE_H
-#define RESOURCE_H
+#pragma once
 
 #include "core/io/resource_uid.h"
 #include "core/object/class_db.h"
@@ -179,5 +178,3 @@ public:
 	static void get_cached_resources(List<Ref<Resource>> *p_resources);
 	static int get_cached_resource_count();
 };
-
-#endif // RESOURCE_H