Revert of [Polymer] update polymer

third_party/polymer/v1_0/components-chromium/iron-overlay-behavior/iron-overlay-manager-extracted.js

 /**
    * @struct
    * @constructor
    * @private
    */
   Polymer.IronOverlayManagerClass = function() {
     /**
      * Used to keep track of the opened overlays.
      * @private {Array<Element>}
      */
@@ skipping 294 matching lines @@
         }
         // Use logical parentNode, or native ShadowRoot host.
         node = Polymer.dom(node).parentNode || node.host;
       }
     },
 
     /**
      * Returns the deepest overlay in the path.
      * @param {Array<Element>=} path
      * @return {Element|undefined}
-     * @suppress {missingProperties}
      * @private
      */
     _overlayInPath: function(path) {
       path = path || [];
       for (var i = 0; i < path.length; i++) {
         if (path[i]._manager === this) {
           return path[i];
         }
       }
     },
@@ skipping 37 matching lines @@
           overlay._onCaptureTab(event);
         }
       }
     },
 
     /**
      * Returns if the overlay1 should be behind overlay2.
      * @param {!Element} overlay1
      * @param {!Element} overlay2
      * @return {boolean}
-     * @suppress {missingProperties}
      * @private
      */
     _shouldBeBehindOverlay: function(overlay1, overlay2) {
-      return !overlay1.alwaysOnTop && overlay2.alwaysOnTop;
+      var o1 = /** @type {?} */ (overlay1);
+      var o2 = /** @type {?} */ (overlay2);
+      return !o1.alwaysOnTop && o2.alwaysOnTop;
     }
   };
 
   Polymer.IronOverlayManager = new Polymer.IronOverlayManagerClass();