[web] - Clean up skipped tests (#124981)

Fixes https://github.com/flutter/flutter/issues/124174
Fixes https://github.com/flutter/flutter/issues/124980

dev/integration_tests/web_e2e_tests/lib/common.dart

@@ -16,24 +16,15 @@ bool get isFirefox => window.navigator.userAgent.toLowerCase().contains('firefox
 /// without penetrating the shadow DOM. In the latter case, if the application
 /// creates platform views, this will also find platform view elements.
 List<Node> findElements(String selector) {
-  final Element? glassPane = document.querySelector('flt-glass-pane');
-  if (glassPane == null) {
+  final Element? flutterView = document.querySelector('flutter-view');
+
+  if (flutterView == null) {
     fail(
-      'Failed to locate <flt-glass-pane>. Possible reasons:\n'
+      'Failed to locate <flutter-view>. Possible reasons:\n'
       ' - The application failed to start'
       ' - `findElements` was called before the application started'
     );
   }
 
-  // TODO(htoor3): Remove shadowRoot selectors once DOM structure PR is merged.
-  final Element? flutterView = document.querySelector('flutter-view');
-
-  if(flutterView != null){
-    return flutterView.querySelectorAll(selector);
-  }
-
-  final ShadowRoot? shadowRoot = glassPane.shadowRoot;
-  return shadowRoot != null
-    ? shadowRoot.querySelectorAll(selector)
-    : glassPane.querySelectorAll(selector);
+  return flutterView.querySelectorAll(selector);
 }

examples/hello_world/test_driver/smoke_web_engine_test.dart

@@ -43,6 +43,6 @@ void main() {
         <dynamic>[],
       ) as WebElement?;
       expect(fltSemantics, isNotNull);
-    }, skip: true); // https://github.com/flutter/flutter/issues/124174
+    });
   });
 }