Polymer: Remove unused app-layout element

third_party/polymer/v1_0/components-chromium/app-layout/app-scroll-effects/effects/parallax-background-extracted.js

-/**
-   * Vertically translate the background based on a factor of the scroll position.
-   */
-  Polymer.AppLayout.registerEffect('parallax-background', {
-    /**
-     * @param {{scalar: string}} config
-     * @this Polymer.AppLayout.ElementWithBackground
-     */
-    setUp: function setUp(config) {
-      var fx = {};
-      var scalar = parseFloat(config.scalar);
-      fx.background = this._getDOMRef('background');
-      fx.backgroundFrontLayer = this._getDOMRef('backgroundFrontLayer');
-      fx.backgroundRearLayer = this._getDOMRef('backgroundRearLayer');
-      fx.deltaBg = fx.backgroundFrontLayer.offsetHeight - fx.background.offsetHeight;
-      if (fx.deltaBg === 0) {
-        if (isNaN(scalar)) {
-          scalar = 0.8;
-        }
-        fx.deltaBg = this._dHeight * scalar;
-      } else {
-        if (isNaN(scalar)) {
-          scalar = 1;
-        }
-        fx.deltaBg = fx.deltaBg * scalar;
-      }
-      this._fxParallaxBackground = fx;
-    },
-    /** @this Polymer.AppLayout.ElementWithBackground */
-    run: function run(p, y) {
-      var fx = this._fxParallaxBackground;
-      this.transform('translate3d(0px, ' + (fx.deltaBg * Math.min(1, p)) + 'px, 0px)', fx.backgroundFrontLayer);
-      if (fx.backgroundRearLayer) {
-        this.transform('translate3d(0px, ' + (fx.deltaBg * Math.min(1, p)) + 'px, 0px)', fx.backgroundRearLayer);
-      }
-    },
-    /** @this Polymer.AppLayout.ElementWithBackground */
-    tearDown: function tearDown() {
-      delete this._fxParallaxBackground;
-    }
-  });