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/dfg/DFGScannable.h b/Source/JavaScriptCore/dfg/DFGScannable.h
index 6b85cc0..7d97a72 100644
--- a/Source/JavaScriptCore/dfg/DFGScannable.h
+++ b/Source/JavaScriptCore/dfg/DFGScannable.h
@@ -23,8 +23,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
-#ifndef DFGScannable_h
-#define DFGScannable_h
+#pragma once
 
 #if ENABLE(DFG_JIT)
 
@@ -45,6 +44,3 @@
 } } // namespace JSC::DFG
 
 #endif // ENABLE(DFG_JIT)
-
-#endif // DFGScannable_h
-