Unreviewed, rolling out r206522.

Roll r206506 back in since the build fix landed in r206521

Reverted changeset:

"Unreviewed, rolling out r206506."
https://bugs.webkit.org/show_bug.cgi?id=162682
http://trac.webkit.org/changeset/206522

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@206525 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/Source/JavaScriptCore/runtime/RegExp.h b/Source/JavaScriptCore/runtime/RegExp.h
index b6c0d77..996571f 100644
--- a/Source/JavaScriptCore/runtime/RegExp.h
+++ b/Source/JavaScriptCore/runtime/RegExp.h
@@ -19,8 +19,7 @@
  *
  */
 
-#ifndef RegExp_h
-#define RegExp_h
+#pragma once
 
 #include "ConcurrentJITLock.h"
 #include "ExecutableAllocator.h"
@@ -152,5 +151,3 @@
 };
 
 } // namespace JSC
-
-#endif // RegExp_h