Use Chromium BUILD to approximate Blimp protocol version, and check it.

blimp/common/protocol_version.h

Index: blimp/common/protocol_version.h
diff --git a/blimp/common/protocol_version.h b/blimp/common/protocol_version.h
deleted file mode 100644
index ea628a2c0fac9df3e37c1c6ff79288d97be88792..0000000000000000000000000000000000000000
--- a/blimp/common/protocol_version.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2015 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.
-
-#ifndef BLIMP_COMMON_PROTOCOL_VERSION_H_
-#define BLIMP_COMMON_PROTOCOL_VERSION_H_
-
-#include "blimp/common/blimp_common_export.h"
-
-namespace blimp {
-
-const int BLIMP_COMMON_EXPORT kProtocolVersion = 0;
-
-// TODO(dtrainor): Move this out or integrate this with kProtocolVersion?
-const char BLIMP_COMMON_EXPORT kEngineVersion[] = "20160209094838";
-
-}  // namespace blimp
-
-#endif  // BLIMP_COMMON_PROTOCOL_VERSION_H_