Remove any unnecessary parens around expressions in interpolations.

pkg/analyzer/test/generated/test_support.dart

Index: pkg/analyzer/test/generated/test_support.dart
diff --git a/pkg/analyzer/test/generated/test_support.dart b/pkg/analyzer/test/generated/test_support.dart
index 58064cf7ee9cc1f0989b053802765b1402dba81b..474fe5567f7918bb6ca81c0f0367635ac2bea2cc 100644
--- a/pkg/analyzer/test/generated/test_support.dart
+++ b/pkg/analyzer/test/generated/test_support.dart
@@ -321,7 +321,7 @@ class EngineTestCase extends JUnitTestCase {
       Type expectedClass, Object object) {
     if (!predicate(object)) {
       JUnitTestCase.fail(
-          "Expected instance of $expectedClass, found ${(object == null ? "null" : object.runtimeType)}");
+          "Expected instance of $expectedClass, found ${object == null ? "null" : object.runtimeType}");
     }
     return object;
   }