Bug 758992 - Make the classes which use the XPCOM nsISupports implementation macros final, to avoid the warning about deleting using a pointer to a base class with virtual functions and no virtual dtor (XPCOM parts); r=bsmedberg

xpcom/io/nsLocalFileUnix.cpp

@@ -8,6 +8,7 @@
  */
 
 #include "mozilla/Util.h"
+#include "mozilla/Attributes.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -97,8 +98,8 @@ using namespace mozilla;
 
 /* directory enumerator */
 class
-nsDirEnumeratorUnix : public nsISimpleEnumerator,
-                      public nsIDirectoryEnumerator
+nsDirEnumeratorUnix MOZ_FINAL : public nsISimpleEnumerator,
+                                public nsIDirectoryEnumerator
 {
     public:
     nsDirEnumeratorUnix();