Send the value of google_brand::GetBrand in component update checks.

components/update_client/utils.h

 // 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.
 
 #ifndef COMPONENTS_UPDATE_CLIENT_UTILS_H_
 #define COMPONENTS_UPDATE_CLIENT_UTILS_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 77 matching lines @@
 
 // Returns the component id of the |component|. The component id is in a
 // format similar with the format of an extension id.
 std::string GetCrxComponentID(const CrxComponent& component);
 
 // Returns true if the actual SHA-256 hash of the |filepath| matches the
 // |expected_hash|.
 bool VerifyFileHash256(const base::FilePath& filepath,
                        const std::string& expected_hash);
 
+// Returns true if the |brand| parameter matches ^([a-zA-Z]{4})?$ .
+bool IsValidBrand(const std::string& brand);
+
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_UTILS_H_