Reformat under Dart 2.7.2

Author: greglittlefield-wf

test/lifecycle_test/util.dart

@@ -40,11 +40,7 @@ mixin LifecycleTestHelper on Component {
       'context': context,
     });
 
-    var lifecycleCallback = props == null
-        ? staticProps == null
-            ? null
-            : staticProps[memberName]
-        : props[memberName];
+    var lifecycleCallback = props == null ? staticProps == null ? null : staticProps[memberName] : props[memberName];
     if (lifecycleCallback != null) {
       return Function.apply(
           lifecycleCallback,