fix esnext tests to reflect new super behaviour

test/fixtures/esnext/es6-classes/anonymous-class.js

@@ -12,11 +12,11 @@ var Dog = class extends Animal {
   type() { return 'dog'; }
 
   sayHi() {
-    return super() + ' WOOF!';
+    return super.sayHi() + ' WOOF!';
   }
 
   static getName() {
-    return super() + '/Dog';
+    return super.getName() + '/Dog';
   }
 };
 

test/fixtures/esnext/es6-classes/class-extend.js

@@ -8,7 +8,7 @@ class Dog extends Animal {
   type() { return 'dog'; }
 
   sayHi() {
-    return super() + ' WOOF!';
+    return super.sayHi() + ' WOOF!';
   }
 }
 

test/fixtures/esnext/es6-classes/static-method.js

@@ -4,13 +4,13 @@ class Tripler {
   }
 
   static toString() {
-    return '3' + super() + '3';
+    return '3' + super.toString() + '3';
   }
 }
 
 class MegaTripler extends Tripler {
   static triple(n=1) {
-    return super(n) * super(n);
+    return super.triple(n) * super.triple(n);
   }
 }
 

test/fixtures/esnext/es6-classes/super-change-proto.js

@@ -11,9 +11,9 @@ class OtherBase {
 class Derived extends Base {
   p() {
     log += '[Derived]';
-    super();
+    super.p();
     Derived.prototype.__proto__ = OtherBase.prototype;
-    super();
+    super.p();
   }
 }