update shadowdom polyfill to latest

pkg/shadow_dom/lib/shadow_dom.min.js

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Object.getOwnPropertyNames(b).forEach(function(c){Object.defineProperty(a,c,Object.getOwnPropertyDescriptor(b,c))}),a}function d(a,b){return Object.getOwnPropertyNames(b).forEach(function(c){switch(c){case"arguments":case"caller":case"length":case"name":case"prototype":case"toString":return}Object.defineProperty(a,c,Object.getOwnPropertyDescriptor(b,c))}),a}function e(a){var b=a.__proto__||Object.getPrototypeOf(a),c=y.get(b);if(c)return c;var d=e(b),f=m(d);return j(b,f,a),f}function f(a,b){h(a,b,!0)}function g(a,b){h(b,a,!1)}function h(a,b,c){Object.getOwnPropertyNames(a).forEach(function(d){if(!(d in b)){A&&a.__lookupGetter__(d);var e;try{e=Object.getOwnPropertyDescriptor(a,d)}catch(f){e=B}var g,h;if(c&&"function"==typeof e.value)return b[d]=function(){return this.impl[d].apply(this.impl,arguments)},void 0;g=function(){return 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b=a.localName;return"content"===b||"shadow"===b}function d(a){return!!a.shadowRoot}function e(a){var b;return a.parentNode||(b=a.defaultView)&&I(b)||null}function f(f,g,h){if(h.length)return h.shift();if(b(f))return f.insertionParent||a.getHostForShadowRoot(f);var i=a.eventParentsTable.get(f);if(i){for(var j=1;j<i.length;j++)h[j-1]=i[j];return i[0]}if(g&&c(f)){var k=f.parentNode;if(k&&d(k))for(var l=a.getShadowTrees(k),m=g.insertionParent,j=0;j<l.length;j++)if(l[j].contains(m))return m}return e(f)}function g(a){for(var d=[],e=a,g=[],i=[];e;){var j=null;if(c(e)){j=h(d);var k=d[d.length-1]||e;d.push(k)}else d.length||d.push(e);var l=d[d.length-1];g.push({target:l,currentTarget:e}),b(e)&&d.pop(),e=f(e,j,i)}return g}function h(a){for(var b=a.length-1;b>=0;b--)if(!c(a[b]))return a[b];return null}function i(d,e){for(var g=[];d;){for(var i=[],k=e,m=void 0;k;){var n=null;if(i.length){if(c(k)&&(n=h(i),j(m))){var o=i[i.length-1];i.push(o)}}else i.push(k);if(l(k,d))return 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null}var E=a.forwardMethodsToWrapper,F=a.mixin,G=a.registerWrapper,H=a.unwrap,I=a.wrap,J=a.wrappers;new SideTable;var K=new SideTable,L=new SideTable,M=new SideTable,N=new SideTable,O=new SideTable,P=new SideTable,Q=new SideTable,R=new SideTable;t.prototype={equals:function(a){return this.handler===a.handler&&this.type===a.type&&this.capture===a.capture},get removed(){return null===this.handler},remove:function(){this.handler=null}};var S=window.Event;u.prototype={get target(){return M.get(this)},get currentTarget(){return N.get(this)},get eventPhase(){return P.get(this)},stopPropagation:function(){Q.set(this,!0)},stopImmediatePropagation:function(){Q.set(this,!0),R.set(this,!0)}},G(S,u,document.createEvent("Event"));var T=w("UIEvent",u),U=w("CustomEvent",u),V={get relatedTarget(){return 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