Format all tests.

tests/lib_strong/html/hidden_dom_1_test.dart

 import 'dart:html';
 
 import 'package:expect/minitest.dart';
 
 // Test that the dart:html API does not leak native jsdom methods:
 //   onfocus setter.
 
 main() {
   test('test1', () {
     document.body.children.add(new Element.html(r'''
 <div id='div1'>
 Hello World!
 </div>'''));
     Element e = document.query('#div1');
     expect(e, isNotNull);
 
-    expect(() { confuse(e).onfocus = null; }, throwsNoSuchMethodError);
+    expect(() {
+      confuse(e).onfocus = null;
+    }, throwsNoSuchMethodError);
   });
-
 }
 
 class Decoy {
-  void set onfocus(x) { throw 'dead code'; }
+  void set onfocus(x) {
+    throw 'dead code';
+  }
 }
 
 confuse(x) => opaqueTrue() ? x : (opaqueTrue() ? new Object() : new Decoy());
 
 /** Returns `true`, but in a way that confuses the compiler. */
-opaqueTrue() => true;  // Expand as needed.
+opaqueTrue() => true; // Expand as needed.