Revert "[msf] Rename Msf to MSF."

This reverts commit 4d1557ffac41e079bcb1abbcf04f512474dcd6fe.

llvm-svn: 277194
diff --git a/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp b/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp
index 40992e9..70b810f 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/NameMap.cpp
@@ -9,8 +9,8 @@
 
 #include "llvm/DebugInfo/PDB/Raw/NameMap.h"
 #include "llvm/ADT/SparseBitVector.h"
-#include "llvm/DebugInfo/MSF/StreamReader.h"
-#include "llvm/DebugInfo/MSF/StreamWriter.h"
+#include "llvm/DebugInfo/Msf/StreamReader.h"
+#include "llvm/DebugInfo/Msf/StreamWriter.h"
 #include "llvm/DebugInfo/PDB/Raw/RawError.h"
 
 using namespace llvm;