Run formatter on a few frontend and kernel files that hadn't been formatted.

pkg/kernel/lib/class_hierarchy.dart

Index: pkg/kernel/lib/class_hierarchy.dart
diff --git a/pkg/kernel/lib/class_hierarchy.dart b/pkg/kernel/lib/class_hierarchy.dart
index 40bc6e7972d429d37d03430eef3af6082b8cfc0b..0945a8522c6d74442b2aadc0a42140023c4ec959 100644
--- a/pkg/kernel/lib/class_hierarchy.dart
+++ b/pkg/kernel/lib/class_hierarchy.dart
@@ -401,8 +401,8 @@ class ClassHierarchy {
   static List<Member> _inheritMembers(
       List<Member> declared, List<Member> inherited,
       {bool skipAbstractMembers: false}) {
-    List<Member> result = <Member>[]
-      ..length = declared.length + inherited.length;
+    List<Member> result = <Member>[]..length =
+        declared.length + inherited.length;
     // Since both lists are sorted, we can fuse them like in merge sort.
     int storeIndex = 0;
     int i = 0, j = 0;