Set the xul document title before layout in case xbl constructors want it b=278286 r+sr=bz

content/xul/document/src/nsXULDocument.cpp

@@ -2973,12 +2973,12 @@ nsXULDocument::ResumeWalk()
     // Everything after this point we only want to do once we're
     // certain that we've been embedded in a presentation shell.
 
-    StartLayout();
-
     nsAutoString title;
     mRootContent->GetAttr(kNameSpaceID_None, nsHTMLAtoms::title, title);
     SetTitle(title);
 
+    StartLayout();
+
     if (mIsWritingFastLoad && IsChromeURI(mDocumentURI))
         gXULCache->WritePrototype(mMasterPrototype);