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

tracing/tracing/base/base64_test.html

Index: tracing/tracing/base/base64_test.html
diff --git a/tracing/tracing/base/base64_test.html b/tracing/tracing/base/base64_test.html
index a2b46d80ad914a9322746ff5777a8217b2de5149..5924613d19e2104c54394bc23c13a1afc5e7c591 100644
--- a/tracing/tracing/base/base64_test.html
+++ b/tracing/tracing/base/base64_test.html
@@ -21,12 +21,14 @@ tr.b.unittest.testSuite(function() {
     assert.equal(buffer.getInt8(0), 97);
 
     tr.b.Base64.DecodeToTypedArray('YWJjZA==', buffer);
-    for (var i = 0; i < 4; i++)
+    for (var i = 0; i < 4; i++) {
       assert.equal(buffer.getInt8(i), 97 + i);
+    }
 
     tr.b.Base64.DecodeToTypedArray('YWJjZGVm', buffer);
-    for (var i = 0; i < 4; i++)
+    for (var i = 0; i < 4; i++) {
       assert.equal(buffer.getInt8(i), 97 + i);
+    }
   });
 
   test('DecodeLengthReturn', function() {