Removed unused delete html container

Author: yogeshsuhagiya

app/code/Magento/Integration/view/adminhtml/templates/integration/popup_container.phtml

@@ -47,14 +47,4 @@
     });
 </script>
 
-<div id="integration-popup-container" style="display: none;"></div>
-<div id="integration-delete-container"
-     class="messages"
-     style="display: none;"
-     title="<?= /* @escapeNotVerified */ __('Are you sure?') ?>">
-    <div class="message message-notice notice">
-        <div>
-            <?= /* @escapeNotVerified */ __("Are you sure you want to delete this integration? You can't undo this action.") ?>
-        </div>
-    </div>
-</div>
+<div id="integration-popup-container" style="display: none;"></div>