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

tracing/tracing/ui/tracks/letter_dot_track.html

Index: tracing/tracing/ui/tracks/letter_dot_track.html
diff --git a/tracing/tracing/ui/tracks/letter_dot_track.html b/tracing/tracing/ui/tracks/letter_dot_track.html
index ef28274961c32f261f6de8974ae6d12425fcf7b5..79c1f062fcbfd4c2250530126fe0296deeecb690 100644
--- a/tracing/tracing/ui/tracks/letter_dot_track.html
+++ b/tracing/tracing/ui/tracks/letter_dot_track.html
@@ -80,8 +80,8 @@ tr.exportTo('tr.ui.tracks', function() {
     },
 
     draw: function(type, viewLWorld, viewRWorld) {
-      if (this.items_ === undefined)
-        return;
+      if (this.items_ === undefined) return;
+
       switch (type) {
         case tr.ui.tracks.DrawType.GENERAL_EVENT:
           this.drawLetterDots_(viewLWorld, viewRWorld);
@@ -120,10 +120,10 @@ tr.exportTo('tr.ui.tracks', function() {
         for (var i = loI; i < items.length; ++i) {
           var item = items[i];
           var x = item.start;
-          if (x - itemRadiusWorld > viewRWorld)
-            break;
-          if (item.selected !== selected)
-            continue;
+          if (x - itemRadiusWorld > viewRWorld) break;
+
+          if (item.selected !== selected) continue;
+
           var xView = dt.xWorldToView(x);
 
           ctx.fillStyle = EventPresenter.getSelectableItemColorAsString(item);
@@ -161,8 +161,7 @@ tr.exportTo('tr.ui.tracks', function() {
     },
 
     addEventsToTrackMap: function(eventToTrackMap) {
-      if (this.items_ === undefined)
-        return;
+      if (this.items_ === undefined) return;
 
       this.items_.forEach(function(item) {
         item.addToTrackMap(eventToTrackMap, this);
@@ -171,8 +170,7 @@ tr.exportTo('tr.ui.tracks', function() {
 
     addIntersectingEventsInRangeToSelectionInWorldSpace: function(
         loWX, hiWX, viewPixWidthWorld, selection) {
-      if (this.items_ === undefined)
-        return;
+      if (this.items_ === undefined) return;
 
       var itemRadiusWorld = viewPixWidthWorld * this.dumpRadiusView;
       tr.b.math.iterateOverIntersectingIntervals(
@@ -196,15 +194,13 @@ tr.exportTo('tr.ui.tracks', function() {
      * @private
      */
     addEventNearToProvidedEventToSelection: function(event, offset, selection) {
-      if (this.items_ === undefined)
-        return;
+      if (this.items_ === undefined) return;
 
       var items = this.items_;
       var index = tr.b.findFirstIndexInArray(items, function(item) {
         return item.modelItem === event;
       });
-      if (index === -1)
-        return false;
+      if (index === -1) return false;
 
       var newIndex = index + offset;
       if (newIndex >= 0 && newIndex < items.length) {
@@ -219,8 +215,7 @@ tr.exportTo('tr.ui.tracks', function() {
 
     addClosestEventToSelection: function(worldX, worldMaxDist, loY, hiY,
         selection) {
-      if (this.items_ === undefined)
-        return;
+      if (this.items_ === undefined) return;
 
       var item = tr.b.math.findClosestElementInSortedArray(
           this.items_,
@@ -228,8 +223,7 @@ tr.exportTo('tr.ui.tracks', function() {
           worldX,
           worldMaxDist);
 
-      if (!item)
-        return;
+      if (!item) return;
 
       item.addToSelection(selection);
     }