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

tracing/tracing/extras/importer/battor_importer.html

Index: tracing/tracing/extras/importer/battor_importer.html
diff --git a/tracing/tracing/extras/importer/battor_importer.html b/tracing/tracing/extras/importer/battor_importer.html
index 45c10bbfae1f59cec3b9e0f6a375f83e73f6ad22..61843be081dfc295360b8b5001588d122b0e6b4c 100644
--- a/tracing/tracing/extras/importer/battor_importer.html
+++ b/tracing/tracing/extras/importer/battor_importer.html
@@ -50,8 +50,9 @@ tr.exportTo('tr.e.importer.battor', function() {
    * @return {boolean} True when events is a BattOr array.
    */
   BattorImporter.canImport = function(events) {
-    if (!(typeof(events) === 'string' || events instanceof String))
+    if (!(typeof(events) === 'string' || events instanceof String)) {
       return false;
+    }
 
     return battorHeaderLineRE.test(events);
   };
@@ -112,11 +113,9 @@ tr.exportTo('tr.e.importer.battor', function() {
       for (var line of lines) {
         line = line.trim();
 
-        if (line.length === 0)
-          continue;
+        if (line.length === 0) continue;
 
-        if (line.startsWith('#'))
-          continue;
+        if (line.startsWith('#')) continue;
 
         // Parse power sample.
         var groups = battorDataLineRE.exec(line);
@@ -137,8 +136,9 @@ tr.exportTo('tr.e.importer.battor', function() {
             tr.b.UnitPrefixScale.METRIC.NONE);
         var syncId = groups[4];
 
-        if (syncId)
+        if (syncId) {
           this.syncTimestampsById_.set(syncId, ts);
+        }
 
         if (voltageInV < 0 || currentInA < 0) {
           this.model_.importWarning({