Remove nsIAtom.h now that it's generated; tidy white space.

xpcom/ds/makefile.win

@@ -32,7 +32,6 @@ EXPORTS =                          \
         nsHashtable.h              \
         nsHashtableEnumerator.h    \
         nsIArena.h                 \
-        nsIAtom.h                  \
         nsIBuffer.h                \
         nsIByteBuffer.h            \
         nsIObserverList.h          \