refactor: Convert protected methods to private (#2358)

src/card-controller/fullscreen/fullscreen-manager.ts

@@ -4,8 +4,8 @@ import { FullscreenProviderFactory } from './factory';
 import { FullscreenProvider } from './types';
 
 export class FullscreenManager {
-  protected _api: CardFullscreenAPI;
-  protected _provider: FullscreenProvider | null;
+  private _api: CardFullscreenAPI;
+  private _provider: FullscreenProvider | null;
 
   constructor(api: CardFullscreenAPI, provider?: FullscreenProvider) {
     this._api = api;
@@ -48,7 +48,7 @@ export class FullscreenManager {
     }
   }
 
-  protected _fullscreenHandler = (): void => {
+  private _fullscreenHandler = (): void => {
     this._api.getExpandManager().setExpanded(false);
 
     this._setConditionState();
@@ -59,7 +59,7 @@ export class FullscreenManager {
     this._api.getCardElementManager().update();
   };
 
-  protected _setConditionState(): void {
+  private _setConditionState(): void {
     this._api.getConditionStateManager()?.setState({
       fullscreen: this.isInFullscreen(),
     });

src/card-controller/fullscreen/webkit/index.ts

@@ -15,7 +15,7 @@ export class WebkitFullScreenProvider
   extends FullscreenProviderBase
   implements FullscreenProvider
 {
-  protected _playTimer = new Timer();
+  private _playTimer = new Timer();
 
   public connect(): void {
     this._api.getConditionStateManager().addListener(this._stateChangeHandler);
@@ -25,7 +25,7 @@ export class WebkitFullScreenProvider
     this._api.getConditionStateManager().removeListener(this._stateChangeHandler);
   }
 
-  protected _stateChangeHandler = (change: ConditionStateChange): void => {
+  private _stateChangeHandler = (change: ConditionStateChange): void => {
     if (
       change.old.mediaLoadedInfo?.mediaPlayerController?.getFullscreenElement() !==
       change.new.mediaLoadedInfo?.mediaPlayerController?.getFullscreenElement()
@@ -42,7 +42,7 @@ export class WebkitFullScreenProvider
     }
   };
 
-  protected _getVideoElement():
+  private _getVideoElement():
     | (HTMLVideoElement & Partial<WebkitHTMLVideoElement>)
     | null {
     const element = this._api
@@ -74,7 +74,7 @@ export class WebkitFullScreenProvider
     }
   }
 
-  protected _endHandler = (): void => {
+  private _endHandler = (): void => {
     this._handler();
 
     // Webkit on iPhone stops the video when exiting fullscreen (why!). This