Fix presubmit style error in parser.cc

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index f40d79808bda73ed067ed77e9f921d93fe247cf6..51065568bac7855a841c4fc724ba1d60d5e633a1 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -2287,11 +2287,13 @@ Block* Parser::ParseVariableDeclarations(
 
 static bool ContainsLabel(ZoneStringList* labels, Handle<String> label) {
   ASSERT(!label.is_null());
-  if (labels != NULL)
-    for (int i = labels->length(); i-- > 0; )
-      if (labels->at(i).is_identical_to(label))
+  if (labels != NULL) {
+    for (int i = labels->length(); i-- > 0; ) {
+      if (labels->at(i).is_identical_to(label)) {
         return true;
-
+      }
+    }
+  }
   return false;
 }