src/vs/workbench/contrib/webviewPanel/browser/webviewIconManager.ts/WebviewIconManager/setIcons
class WebviewIconManager:	public setIcons(
		webviewId: string,
		iconPath: WebviewIcons | undefined,
	) {
		if (iconPath) {
			this._icons.set(webviewId, iconPath);
		} else {
			this._icons.delete(webviewId);
		}

		this.updateStyleSheet();
	}