message: Rename ResizeHandler to ResizeNotifier
diff: @@ -106,7 +106,7 @@ interface ResizeCallback {
  (target: Element, contentRect: DOMRectReadOnly): void;
  }
  -class ResizeHandler {
  +class ResizeNotifier {
  private _resizeObserver: ResizeObserver;
  private _observedElementsMap = new WeakMap<Element, ResizeCallback>();
  @@ -145,7 +145,7 @@ export class EmbeddedViewer extends ViewerElement implements Commandable,
  static EVENT_FRAME_POP_OUT = 'frame-pop-out';
  static EVENT_SCROLL_MOVE = 'scroll-move';
  - private static _resizeHandler = new ResizeHandler();
  + private static _resizeHandler = new ResizeNotifier();
  /**
  * Type guard for detecting a EtEmbeddedViewer instance.
  