Roll Polymer to 1.3.1

third_party/polymer/v1_0/components-chromium/iron-icon/iron-icon-extracted.js

 Polymer({
 
       is: 'iron-icon',
 
       properties: {
 
         /**
          * The name of the icon to use. The name should be of the form:
          * `iconset_name:icon_name`.
          */
@@ skipping 18 matching lines @@
          */
         src: {
           type: String,
           observer: '_srcChanged'
         },
 
         /**
          * @type {!Polymer.IronMeta}
          */
         _meta: {
-          value: Polymer.Base.create('iron-meta', {type: 'iconset'})
+          value: Polymer.Base.create('iron-meta', {type: 'iconset'}),
+          observer: '_updateIcon'
         }
 
       },
 
       _DEFAULT_ICONSET: 'icons',
 
       _iconChanged: function(icon) {
         var parts = (icon || '').split(':');
         this._iconName = parts.pop();
         this._iconsetName = parts.pop() || this._DEFAULT_ICONSET;
         this._updateIcon();
       },
 
       _srcChanged: function(src) {
         this._updateIcon();
       },
 
       _usesIconset: function() {
         return this.icon || !this.src;
       },
 
       /** @suppress {visibility} */
       _updateIcon: function() {
         if (this._usesIconset()) {
-          if (this._iconsetName) {
+          if (this._img && this._img.parentNode) {
+            Polymer.dom(this.root).removeChild(this._img);
+          }
+          if (this._iconName === "") {
+            if (this._iconset) {
+              this._iconset.removeIcon(this);
+            }
+          } else if (this._iconsetName && this._meta) {
             this._iconset = /** @type {?Polymer.Iconset} */ (
               this._meta.byKey(this._iconsetName));
             if (this._iconset) {
               this._iconset.applyIcon(this, this._iconName, this.theme);
               this.unlisten(window, 'iron-iconset-added', '_updateIcon');
             } else {
               this.listen(window, 'iron-iconset-added', '_updateIcon');
             }
           }
         } else {
+          if (this._iconset) {
+            this._iconset.removeIcon(this);
+          }
           if (!this._img) {
             this._img = document.createElement('img');
             this._img.style.width = '100%';
             this._img.style.height = '100%';
             this._img.draggable = false;
           }
           this._img.src = this.src;
           Polymer.dom(this.root).appendChild(this._img);
         }
       }
 
     });