[ESLint] Fix violations when enabling curly rule in eslint.

tracing/tracing/model/device_test.html

Index: tracing/tracing/model/device_test.html
diff --git a/tracing/tracing/model/device_test.html b/tracing/tracing/model/device_test.html
index 0bfbe905d50c5d2d3f549db25527c9d2f40f6881..887a4032cb017b064c57e1d9e079ba4db0ede6f2 100644
--- a/tracing/tracing/model/device_test.html
+++ b/tracing/tracing/model/device_test.html
@@ -52,8 +52,9 @@ tr.b.unittest.testSuite(function() {
   test('childEventContainers_noPowerSeries', function() {
     var device = new Device(new Model());
     var childEventContainers = [];
-    for (var container of device.childEventContainers())
+    for (var container of device.childEventContainers()) {
       childEventContainers.push(container);
+    }
     assert.deepEqual(childEventContainers, []);
   });
 
@@ -61,8 +62,9 @@ tr.b.unittest.testSuite(function() {
     var device = new Device(new Model());
     device.powerSeries = new PowerSeries(device);
     var childEventContainers = [];
-    for (var container of device.childEventContainers())
+    for (var container of device.childEventContainers()) {
       childEventContainers.push(container);
+    }
     assert.deepEqual(childEventContainers, [device.powerSeries]);
   });
 });