declare some variables before assigning them to avoid JS warnings

patch by Simon Bünzli
bug=342458
r=myk
a=darin on behalf of drivers for 1.8 branch


git-svn-id: svn://10.0.0.236/branches/MOZILLA_1_8_BRANCH@200742 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/browser/components/bookmarks/content/bookmarks.js

@@ -86,6 +86,10 @@ var kIOContractID;
 var kIOIID;
 var IOSVC;
 
+var kMICSUMContractID;
+var kMICSUMIID;
+var MICSUMSVC;
+
 var gBmProperties;
 var gBkmkTxnSvc;