Polymer: Remove unused app-layout element

third_party/polymer/v1_0/components-chromium/app-layout/app-box/app-box-extracted.js

-Polymer({
-      is: 'app-box',
-
-      behaviors: [
-        Polymer.AppScrollEffectsBehavior,
-        Polymer.IronResizableBehavior
-      ],
-
-      listeners: {
-        'iron-resize': '_resizeHandler'
-      },
-
-      /**
-       * The current scroll progress.
-       *
-       * @type {number}
-       */
-      _progress: 0,
-
-      attached: function() {
-        this.resetLayout();
-      },
-
-      /**
-       * Resets the layout. This method is automatically called when the element is attached to the DOM.
-       *
-       * @method resetLayout
-       */
-      resetLayout: function() {
-        this.debounce('_resetLayout', function() {
-          // noop if the box isn't in the rendered tree
-          if (this.offsetWidth === 0 && this.offsetHeight === 0) {
-            return;
-          }
-
-          var scrollTop = this._clampedScrollTop;
-          var savedDisabled = this.disabled;
-
-          this.disabled = true;
-          this._elementTop = this._getElementTop();
-          this._elementHeight = this.offsetHeight;
-          this._cachedScrollTargetHeight = this._scrollTargetHeight;
-          this._setUpEffect();
-          this._updateScrollState(scrollTop);
-          this.disabled = savedDisabled;
-        }, 1);
-      },
-
-      _getElementTop: function() {
-        var currentNode = this;
-        var top = 0;
-
-        while (currentNode && currentNode !== this.scrollTarget) {
-          top += currentNode.offsetTop;
-          currentNode = currentNode.offsetParent;
-        }
-        return top;
-      },
-
-      _updateScrollState: function(scrollTop) {
-        if (this.isOnScreen()) {
-          var viewportTop = this._elementTop - scrollTop;
-          this._progress = 1 - (viewportTop + this._elementHeight) / this._cachedScrollTargetHeight;
-          this._runEffects(this._progress, scrollTop);
-        }
-      },
-
-      /**
-       * Returns true if this app-box is on the screen.
-       * That is, visible in the current viewport.
-       *
-       * @method isOnScreen
-       * @return {boolean}
-       */
-      isOnScreen: function() {
-        return this._elementTop < this._scrollTop + this._cachedScrollTargetHeight
-            && this._elementTop + this._elementHeight > this._scrollTop;
-      },
-
-      _resizeHandler: function() {
-        this.resetLayout();
-      },
-
-      _getDOMRef: function(id) {
-        if (id === 'background') {
-          return this.$.background;
-        }
-        if (id === 'backgroundFrontLayer') {
-          return this.$.backgroundFrontLayer;
-        }
-      },
-
-      /**
-       * Returns an object containing the progress value of the scroll effects.
-       *
-       * @method getScrollState
-       * @return {Object}
-       */
-      getScrollState: function() {
-        return { progress: this._progress };
-      }
-    });