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

tracing/tracing/ui/tracks/counter_track_test.html

Index: tracing/tracing/ui/tracks/counter_track_test.html
diff --git a/tracing/tracing/ui/tracks/counter_track_test.html b/tracing/tracing/ui/tracks/counter_track_test.html
index 4a1b8b0badc9c235a268e40345dac113d59d6fe8..6254094d1dd435ac870e6a2f5b2b1e7b62bde8ab 100644
--- a/tracing/tracing/ui/tracks/counter_track_test.html
+++ b/tracing/tracing/ui/tracks/counter_track_test.html
@@ -161,15 +161,17 @@ tr.b.unittest.testSuite(function() {
       var sel = new tr.model.EventSet();
       track.addClosestEventToSelection(-1, 1, 0, 0, sel);
       assert.equal(sel.length, 2);
-      for (var event of sel)
+      for (var event of sel) {
         assert.equal(event.getSampleIndex(), 0);
+      }
 
       // Between and closer to sample before.
       var sel = new tr.model.EventSet();
       track.addClosestEventToSelection(1.3, 1, 0, 0, sel);
       assert.equal(sel.length, 2);
-      for (var event of sel)
+      for (var event of sel) {
         assert.equal(event.getSampleIndex(), 1);
+      }
 
       // Between samples with bad range.
       var sel = new tr.model.EventSet();
@@ -180,15 +182,17 @@ tr.b.unittest.testSuite(function() {
       var sel = new tr.model.EventSet();
       track.addClosestEventToSelection(4.7, 6, 0, 0, sel);
       assert.equal(sel.length, 2);
-      for (var event of sel)
+      for (var event of sel) {
         assert.equal(event.getSampleIndex(), 5);
+      }
 
       // After last sample with good range.
       var sel = new tr.model.EventSet();
       track.addClosestEventToSelection(8.5, 2, 0, 0, sel);
       assert.equal(sel.length, 2);
-      for (var event of sel)
+      for (var event of sel) {
         assert.equal(event.getSampleIndex(), 7);
+      }
 
       // After last sample with bad range.
       var sel = new tr.model.EventSet();