Add missing license header.

Author: zturner0826

src/Core/VsChromiumVersion.cs

@@ -1,4 +1,8 @@
-using System;
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;