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

tracing/tracing/metrics/system_health/long_tasks_metric.html

Index: tracing/tracing/metrics/system_health/long_tasks_metric.html
diff --git a/tracing/tracing/metrics/system_health/long_tasks_metric.html b/tracing/tracing/metrics/system_health/long_tasks_metric.html
index 9ae18c5cd13ec4dc6c7cffd21d6f9efe728deea7..e99565d709e0b0fccc29a56cc68beff44f5d432b 100644
--- a/tracing/tracing/metrics/system_health/long_tasks_metric.html
+++ b/tracing/tracing/metrics/system_health/long_tasks_metric.html
@@ -33,11 +33,11 @@ tr.exportTo('tr.metrics.sh', function() {
       thread, opt_range, cb, opt_this) {
     thread.sliceGroup.topLevelSlices.forEach(function(slice) {
       if (opt_range &&
-          !opt_range.intersectsExplicitRangeInclusive(slice.start, slice.end))
+          !opt_range.intersectsExplicitRangeInclusive(slice.start, slice.end)) {
         return;
+      }
 
-      if (slice.duration < LONG_TASK_MS)
-        return;
+      if (slice.duration < LONG_TASK_MS) return;
 
       cb.call(opt_this, slice);
     });
@@ -57,8 +57,8 @@ tr.exportTo('tr.metrics.sh', function() {
     if (modelHelper !== undefined) {
       tr.b.dictionaryValues(modelHelper.rendererHelpers).forEach(
           function(rendererHelper) {
-            if (!rendererHelper.mainThread)
-              return;
+            if (!rendererHelper.mainThread) return;
+
             cb.call(opt_this, rendererHelper.mainThread);
           });
     }