Revert "Set up key backup using non-deprecated APIs (#12005)" (#12102)

playwright/pages/ElementAppPage.ts

@@ -51,19 +51,6 @@ export class ElementAppPage {
         return this.settings.closeDialog();
     }
 
-    public async getClipboard(): Promise<string> {
-        return await this.page.evaluate(() => navigator.clipboard.readText());
-    }
-
-    /**
-     * Find an open dialog by its title
-     */
-    public async getDialogByTitle(title: string, timeout = 5000): Promise<Locator> {
-        const dialog = this.page.locator(".mx_Dialog");
-        await dialog.getByRole("heading", { name: title }).waitFor({ timeout });
-        return dialog;
-    }
-
     /**
      * Opens the given room by name. The room must be visible in the
      * room list, but the room list may be folded horizontally, and the