Revert "Skip flaky test in expression_evaluation_test.dart (#148737)"

This reverts commit b6bed5aaf2c70e8c5d62a377797234beb923b3e6.

packages/flutter_tools/test/integration.shard/expression_evaluation_test.dart

diff --git a/packages/flutter_tools/test/integration.shard/expression_evaluation_test.dart b/packages/flutter_tools/test/integration.shard/expression_evaluation_test.dart
index 236719e..4676de1 100644
--- a/packages/flutter_tools/test/integration.shard/expression_evaluation_test.dart
+++ b/packages/flutter_tools/test/integration.shard/expression_evaluation_test.dart
@@ -89,7 +89,7 @@
     await breakInBuildMethod(flutter);
     await evaluateComplexReturningExpressions(flutter);
     await cleanProject();
-  }, skip: true);  // https://github.com/flutter/flutter/issues/148704
+  });
 }
 
 void batch2() {