back out unapproved changes to Navigator context menus. See bug 70830.

suite/common/contentAreaContextOverlay.xul

@@ -106,10 +106,6 @@
                 label="&viewBGImageCmd.label;"
                 accesskey="&viewBGImageCmd.accesskey;"
                 oncommand="gContextMenu.viewBGImage();"/>
-      <menu id="browserContextCharsetMenu" 
-                onpopupshowing="CreateMenu('browser');UpdateMenus(event)"
-                oncommand="MultiplexHandler(event)"/>
-
       <menuseparator id="context-sep-view"/>
       <!-- Misc ==================================== -->
       <menuitem id="context-bookmarkpage"