Bug 106053, remove unused XHTML namespace declarations, and fix incorrect namespace usages. r=harishd, sr=hewitt.

suite/browser/pageInfo.xul

@@ -37,7 +37,7 @@
   %pageInfoDTD;
 ]>
 
-<window id="main-window" xmlns:html="http://www.w3.org/1999/xhtml"
+<window id="main-window"
   xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
   windowtype="Browser:page-info"
   onload="onLoadPageInfo()"