Bug 587593 - Remove extra usage line in firefox --help output. r=gavin.sharp, a2.0=bsmedberg

--HG--
extra : rebase_source : aae2337678da371e1c3886642fce0c55b1d66478

browser/components/nsBrowserContentHandler.js

@@ -853,8 +853,7 @@ nsDefaultCommandLineHandler.prototype = {
     }
   },
 
-  // XXX localize me... how?
-  helpInfo : "Usage: firefox [-flags] [<url>]\n",
+  helpInfo : "",
 };
 
 var components = [nsBrowserContentHandler, nsDefaultCommandLineHandler];