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

tracing/tracing/model/helpers/chrome_browser_helper.html

Index: tracing/tracing/model/helpers/chrome_browser_helper.html
diff --git a/tracing/tracing/model/helpers/chrome_browser_helper.html b/tracing/tracing/model/helpers/chrome_browser_helper.html
index 8da03be35351cd88af1fd1a49555a52c9937855b..81bd98a20099863c27338a520d7326cf87490a72 100644
--- a/tracing/tracing/model/helpers/chrome_browser_helper.html
+++ b/tracing/tracing/model/helpers/chrome_browser_helper.html
@@ -18,8 +18,9 @@ tr.exportTo('tr.model.helpers', function() {
   function ChromeBrowserHelper(modelHelper, process) {
     tr.model.helpers.ChromeProcessHelper.call(this, modelHelper, process);
     this.mainThread_ = process.findAtMostOneThreadNamed('CrBrowserMain');
-    if (!process.name)
+    if (!process.name) {
       process.name = ChromeBrowserHelper.PROCESS_NAME;
+    }
   }
 
   ChromeBrowserHelper.PROCESS_NAME = 'Browser';
@@ -65,14 +66,15 @@ tr.exportTo('tr.model.helpers', function() {
 
     get hasLatencyEvents() {
       var hasLatency = false;
-      for (var thread of this.modelHelper.model.getAllThreads())
+      for (var thread of this.modelHelper.model.getAllThreads()) {
         for (var event of thread.getDescendantEvents()) {
-          if (!event.isTopLevel)
-            continue;
-          if (!(event instanceof tr.e.cc.InputLatencyAsyncSlice))
+          if (!event.isTopLevel) continue;
+          if (!(event instanceof tr.e.cc.InputLatencyAsyncSlice)) {
             continue;
+          }
           hasLatency = true;
         }
+      }
       return hasLatency;
     },
 
@@ -87,9 +89,11 @@ tr.exportTo('tr.model.helpers', function() {
     getAllAsyncSlicesMatching: function(pred, opt_this) {
       var events = [];
       this.iterAllThreads(function(thread) {
-        for (var slice of thread.getDescendantEvents())
-          if (pred.call(opt_this, slice))
+        for (var slice of thread.getDescendantEvents()) {
+          if (pred.call(opt_this, slice)) {
             events.push(slice);
+          }
+        }
       });
       return events;
     },
@@ -105,12 +109,12 @@ tr.exportTo('tr.model.helpers', function() {
             match = true;
           }
 
-          if (!match)
-            return;
+          if (!match) return;
 
           if (rangeOfInterest.intersectsExplicitRangeInclusive(
-              slice.start, slice.end))
+              slice.start, slice.end)) {
             networkEvents.push(slice);
+          }
         });
       });
       return networkEvents;