Remove _upgradeProperty helper

Author: MattiasBuelens

src/components/Button.ts

@@ -50,14 +50,6 @@ export class Button extends LitElement {
         }
     }
 
-    protected _upgradeProperty(prop: keyof this) {
-        if (this.hasOwnProperty(prop)) {
-            let value = this[prop];
-            delete this[prop];
-            this[prop] = value;
-        }
-    }
-
     connectedCallback(): void {
         super.connectedCallback();
 

src/components/ChromecastButton.ts

@@ -23,7 +23,6 @@ export class ChromecastButton extends CastButton {
 
     constructor() {
         super();
-        this._upgradeProperty('player');
     }
 
     override connectedCallback() {

src/components/RadioGroup.ts

@@ -34,15 +34,6 @@ export class RadioGroup extends LitElement {
 
     constructor() {
         super();
-        this._upgradeProperty('deviceType');
-    }
-
-    protected _upgradeProperty(prop: keyof this) {
-        if (this.hasOwnProperty(prop)) {
-            let value = this[prop];
-            delete this[prop];
-            this[prop] = value;
-        }
     }
 
     connectedCallback(): void {