Format all tests.

tests/language/covariant_override_test.dart

-
 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library covariant_override_test;
 
 // This test contains cases where `covariant` is used as intended.
 
 abstract class A {
   A(this.f1, this.f2, this.f3);
@@ skipping 21 matching lines @@
   covariant Object f1;
 
   // Normal usage on field, "ad hoc": subclass requests covariance.
   Object f2;
 
   // Syntactic special case.
   Object f3;
 }
 
 abstract class B extends A {
-  B(num f1, num f2, num f3): super(f1, f2, f3);
+  B(num f1, num f2, num f3) : super(f1, f2, f3);
 
   void m1(num n);
   void m2(covariant num n);
   void m3(covariant n);
   void m4([num n]);
   void m5([covariant num n]);
   void m6([covariant n]);
   void m7({num arg});
   void m8({covariant num arg});
   void m9({covariant arg});
   void set f1(num n);
   void set f2(covariant num n);
   void set f3(covariant n);
 }
 
 class C extends B {
-  C(int f1, int f2, int f3): super(f1, f2, f3);
-  
+  C(int f1, int f2, int f3) : super(f1, f2, f3);
+
   void m1(int i) {}
   void m2(int i) {}
   void m3(int i) {}
   void m4([int i]) {}
   void m5([int i]) {}
   void m6([int i]) {}
   void m7({int arg}) {}
   void m8({int arg}) {}
   void m9({int arg}) {}
   void set f1(int i) {}
@@ skipping 11 matching lines @@
   a.m4(42);
   a.m5(42);
   a.m6(42);
   a.m7(arg: 42);
   a.m8(arg: 42);
   a.m9(arg: 42);
   a.f1 = 42;
   a.f2 = 42;
   a.f3 = 42;
 }