Yet another attempt to fix result & result nodes leaks (see bug 381239 comment 13)

browser/components/places/content/menu.xml

@@ -63,6 +63,7 @@
       
       <destructor><![CDATA[
         this._result = null;
+        this._resultNode = null;
       ]]></destructor>
 
       <method name="_init">

browser/components/places/content/toolbar.xml

@@ -104,6 +104,7 @@
         this.genericAnnoObserver.removeObserver("bookmarks/generatedTitle",
                                                 this._generatedTitleAnnoObserver);
         PlacesUtils.annotations.removeObserver(this.genericAnnoObserver);
+        this._result.viewer = null;
         this._result = null;
       ]]></destructor>
 

browser/components/places/content/tree.xml

@@ -58,7 +58,8 @@
       ]]></constructor>
 
       <destructor><![CDATA[ 
-        this._result.view = null;
+        this._result.viewer = null;
+        this.view = null;
         this._result = null;
       ]]></destructor>