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

tracing/tracing/model/cpu_slice.html

Index: tracing/tracing/model/cpu_slice.html
diff --git a/tracing/tracing/model/cpu_slice.html b/tracing/tracing/model/cpu_slice.html
index f42704b2463e5858fddf136d44aa18e42d129c0a..290181f8a3229d5b3ba17269ddd2f7ef1c198006 100644
--- a/tracing/tracing/model/cpu_slice.html
+++ b/tracing/tracing/model/cpu_slice.html
@@ -36,15 +36,18 @@ tr.exportTo('tr.model', function() {
     },
 
     getAssociatedTimeslice: function() {
-      if (!this.threadThatWasRunning)
+      if (!this.threadThatWasRunning) {
         return undefined;
+      }
       var timeSlices = this.threadThatWasRunning.timeSlices;
       for (var i = 0; i < timeSlices.length; i++) {
         var timeSlice = timeSlices[i];
-        if (timeSlice.start !== this.start)
+        if (timeSlice.start !== this.start) {
           continue;
-        if (timeSlice.duration !== this.duration)
+        }
+        if (timeSlice.duration !== this.duration) {
           continue;
+        }
         return timeSlice;
       }
       return undefined;