Fix issue with Closure Compiler and PR 470 (#476)

Author: dfreedm

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Fixed
 * Fixed a bug where we broke compatibility with closure compiler's property renaming optimizations. JSCompiler_renameProperty can't be a module export ([#465](https://github.com/Polymer/lit-element/pull/465)).
 * Fixed an issue with inheriting from `styles` property when extending a superclass that is never instanced. ([#470](https://github.com/Polymer/lit-element/pull/470)).
+* Fixed an issue with Closure Compiler and ([#470](https://github.com/Polymer/lit-element/pull/470)) ([#476](https://github.com/Polymer/lit-element/pull/476)).
 
 ## [2.0.0-rc.3] - 2019-01-18
 ### Fixed

src/lit-element.ts

@@ -70,6 +70,7 @@ export class LitElement extends UpdatingElement {
 
   private static _styles: CSSResult[]|undefined;
 
+  /** @nocollapse */
   protected static finalize() {
     super.finalize();
     // Prepare styling that is stamped at first render time. Styling
@@ -79,6 +80,7 @@ export class LitElement extends UpdatingElement {
       this._styles || [];
   }
 
+  /** @nocollapse */
   private static _getUniqueStyles(): CSSResult[] {
     // Take care not to call `this.styles` multiple times since this generates
     // new CSSResults each time.