Bug 252468 Remove outdated autostretch attribute from the tree

Relanding toolkit part of patch v2 following landing of aviary branch


git-svn-id: svn://10.0.0.236/trunk@166113 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/toolkit/components/alerts/resources/content/alert.xul

@@ -32,7 +32,7 @@ Rights Reserved.
   <hbox id="alertBox" class="alertBox">
     
     <hbox class="alertImageBox" align="center" valign="center">
-      <image id="alertImage" autostretch="never"/>
+      <image id="alertImage"/>
     </hbox>
 
     <vbox id="alertTextBox" class="alertTextBox">

mozilla/toolkit/components/help/content/help.xul

@@ -409,7 +409,7 @@
             </vbox>
 
             <splitter id="helpsidebar-splitter" collapse="before"
-                    persist="state hidden" autostretch="never" state="open">
+                    persist="state hidden" state="open">
             </splitter>
 
             <vbox id="appcontent" flex="3">