Improve code style.

Change-Id: I26e043849bce2a4b41ae132fbe0c882f4a6f112f
diff --git a/slang.h b/slang.h
index 9c657f9..f03d9f6 100644
--- a/slang.h
+++ b/slang.h
@@ -14,21 +14,21 @@
  * limitations under the License.
  */
 
-#ifndef _SLANG_COMPILER_SLANG_H
-#define _SLANG_COMPILER_SLANG_H
+#ifndef _FRAMEWORKS_COMPILE_SLANG_SLANG_H_  // NOLINT
+#define _FRAMEWORKS_COMPILE_SLANG_SLANG_H_
 
 #include <cstdio>
 #include <string>
 #include <vector>
 
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/IntrusiveRefCntPtr.h"
-
 #include "clang/Basic/TargetOptions.h"
 
-#include "slang_pragma_recorder.h"
+#include "llvm/ADT/IntrusiveRefCntPtr.h"
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/StringRef.h"
+
 #include "slang_diagnostic_buffer.h"
+#include "slang_pragma_recorder.h"
 
 namespace llvm {
   class tool_output_file;
@@ -194,6 +194,7 @@
 
   virtual ~Slang();
 };
-}
 
-#endif  // _SLANG_COMPILER_SLANG_H
+}  // namespace slang
+
+#endif  // _FRAMEWORKS_COMPILE_SLANG_SLANG_H_  NOLINT