Speculatively backout changeset 926d081e02d6 (bug 904104) for causing intermittent Windows XP debug mochitest-bc crashes.

toolkit/components/social/MozSocialAPI.jsm

@@ -66,11 +66,6 @@ function injectController(doc, topic, data) {
       return;
     }
 
-    // we always handle window.close on social content, even if they are not
-    // "enabled".  "enabled" is about the worker state and a provider may
-    // still be in e.g. the share panel without having their worker enabled.
-    handleWindowClose(window);
-
     SocialService.getProvider(doc.nodePrincipal.origin, function(provider) {
       if (provider && provider.enabled) {
         attachToWindow(provider, window);
@@ -219,9 +214,7 @@ function attachToWindow(provider, targetWindow) {
       schedule(function () { port.close(); });
     });
   }
-}
 
-function handleWindowClose(targetWindow) {
   // We allow window.close() to close the panel, so add an event handler for
   // this, then cancel the event (so the window itself doesn't die) and
   // close the panel instead.