Fixing js strict warning about function not always returning a value. sr=ben

xpfe/browser/resources/content/navigatorDD.js

@@ -246,7 +246,7 @@ var personalToolbarObserver = {
       if (aEvent.target.parentNode != inner && aEvent.target != inner) 
         {
           aDragSession.canDrop = false;
-          return;
+          return false;
         }
       
       if (this.mCurrentDragOverButton != aEvent.target ||

xpfe/communicator/resources/content/contentAreaDD.js

@@ -165,6 +165,7 @@ var contentAreaDNDObserver = {
 
       // we use the url for text/unicode data if an anchor is being dragged, rather than
       // the title text of the link or the alt text for an anchor image. 
+      return true;
     },
 
   onDragOver: function (aEvent, aFlavour, aDragSession)