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

pkg/front_end/testcases/rasta/super_operator.dart

Index: pkg/front_end/testcases/rasta/super_operator.dart
diff --git a/pkg/front_end/testcases/rasta/super_operator.dart b/pkg/front_end/testcases/rasta/super_operator.dart
index 05fa6cd155f768b45fb1c95dbd60e85697c95217..a50e58668dab4c118dc55872bea9dcf35962636d 100644
--- a/pkg/front_end/testcases/rasta/super_operator.dart
+++ b/pkg/front_end/testcases/rasta/super_operator.dart
@@ -3,19 +3,19 @@
 // BSD-style license that can be found in the LICENSE.md file.
 
 class A {
-  operator + (String s) => null;
+  operator +(String s) => null;
 
-  operator [] (i) => null;
+  operator [](i) => null;
 
-  operator []= (i, val) {}
+  operator []=(i, val) {}
 }
 
 class B extends A {
-  operator + (String s) => super + ("${s}${s}");
+  operator +(String s) => super + ("${s}${s}");
 
-  operator [] (i) => super[i];
+  operator [](i) => super[i];
 
-  operator []= (i, val) => super[i++] += val;
+  operator []=(i, val) => super[i++] += val;
 }
 
 class Autobianchi {