Update Polymer from 1.2.1 -> 1.2.3

third_party/polymer/v1_0/components-chromium/iron-behaviors/iron-button-state-extracted.js

 /**
    * @demo demo/index.html
    * @polymerBehavior Polymer.IronButtonState
    */
   Polymer.IronButtonStateImpl = {
 
     properties: {
 
       /**
        * If true, the user is currently holding down the button.
@@ skipping 102 matching lines @@
       this._setPointerDown(true);
       this._setPressed(true);
       this._setReceivedFocusFromKeyboard(false);
     },
 
     _upHandler: function() {
       this._setPointerDown(false);
       this._setPressed(false);
     },
 
-    __isFocusedLightDescendant: function(target) {
-      var root = Polymer.dom(this).getOwnerRoot() || document;
-      var focusedElement = root.activeElement;
-
-      // TODO(noms): remove the `this !== target` check once polymer#2610 is fixed.
-      return this !== target && this.isLightDescendant(target) && target == focusedElement;
-    },
-
     /**
      * @param {!KeyboardEvent} event .
      */
     _spaceKeyDownHandler: function(event) {
       var keyboardEvent = event.detail.keyboardEvent;
       var target = Polymer.dom(keyboardEvent).localTarget;
 
       // Ignore the event if this is coming from a focused light child, since that
       // element will deal with it.
-      if (this.__isFocusedLightDescendant(target))
+      if (this.isLightDescendant(target))
         return;
 
       keyboardEvent.preventDefault();
       keyboardEvent.stopImmediatePropagation();
       this._setPressed(true);
     },
 
     /**
      * @param {!KeyboardEvent} event .
      */
     _spaceKeyUpHandler: function(event) {
       var keyboardEvent = event.detail.keyboardEvent;
       var target = Polymer.dom(keyboardEvent).localTarget;
 
       // Ignore the event if this is coming from a focused light child, since that
       // element will deal with it.
-      if (this.__isFocusedLightDescendant(target))
+      if (this.isLightDescendant(target))
         return;
 
       if (this.pressed) {
         this._asyncClick();
       }
       this._setPressed(false);
     },
 
     // trigger click asynchronously, the asynchrony is useful to allow one
     // event handler to unwind before triggering another event
@@ skipping 41 matching lines @@
       }
     }
 
   };
 
   /** @polymerBehavior */
   Polymer.IronButtonState = [
     Polymer.IronA11yKeysBehavior,
     Polymer.IronButtonStateImpl
   ];