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

tracing/tracing/model/source_info/source_info.html

Index: tracing/tracing/model/source_info/source_info.html
diff --git a/tracing/tracing/model/source_info/source_info.html b/tracing/tracing/model/source_info/source_info.html
index 1a72aa0d0d8f87016b9c5e22bb7d0be63a820a57..0dccbb2f226436123c4261f1ee8fb4efec74a011 100644
--- a/tracing/tracing/model/source_info/source_info.html
+++ b/tracing/tracing/model/source_info/source_info.html
@@ -31,8 +31,7 @@ tr.exportTo('tr.model.source_info', function() {
     },
 
     get domain() {
-      if (!this.file_)
-        return undefined;
+      if (!this.file_) return undefined;
       var domain = this.file_.match(/(.*:\/\/[^:\/]*)/i);
       return domain ? domain[1] : undefined;
     },
@@ -40,12 +39,15 @@ tr.exportTo('tr.model.source_info', function() {
     toString: function() {
       var str = '';
 
-      if (this.file_)
+      if (this.file_) {
         str += this.file_;
-      if (this.line_ > 0)
+      }
+      if (this.line_ > 0) {
         str += ':' + this.line_;
-      if (this.column_ > 0)
+      }
+      if (this.column_ > 0) {
         str += ':' + this.column_;
+      }
       return str;
     }
   };