Including nsString.h directly. It is included indirectly by nsFileSpec. This

prep work for the nsIFile landing.

mailnews/imap/src/nsImapStringBundle.cpp

@@ -22,6 +22,7 @@
 #include "prprf.h"
 #include "prmem.h"
 #include "nsCOMPtr.h"
+#include "nsString.h"
 #include "nsIStringBundle.h"
 #include "nsImapStringBundle.h"
 #include "nsIServiceManager.h"

mailnews/local/src/nsLocalStringBundle.cpp

@@ -22,6 +22,7 @@
 #include "prprf.h"
 #include "prmem.h"
 #include "nsCOMPtr.h"
+#include "nsString.h"
 #include "nsIStringBundle.h"
 #include "nsLocalStringBundle.h"
 #include "nsIServiceManager.h"