Revert part of 1f86864e causing Windows build trouble.

Change-Id: I835f8e33565d20d9fe371cafeededdd32f157f98

extensions/source/scanner/scanner.hxx

@@ -43,6 +43,7 @@ class ScannerManager:
 {
 protected:
 
+    osl::Mutex                              maProtector;
     void*                                   mpData;
 
     static void                             AcquireData();