Exclude ProtectorService code from Android build.

chrome/browser/protector/protector_utils.h

+// Copyright (c) 2012 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 CHROME_BROWSER_PROTECTOR_PROTECTOR_UTILS_H_
+#define CHROME_BROWSER_PROTECTOR_PROTECTOR_UTILS_H_
+#pragma once
+
+#include <string>
+
+namespace protector {
+
+// Signs string value with protector's key.
+std::string SignSetting(const std::string& value);
+
+// Returns true if the signature is valid for the specified key.
+bool IsSettingValid(const std::string& value, const std::string& signature);
+
+// Whether the Protector feature is enabled.
+bool IsEnabled();
+
+}  // namespace protector
+
+#endif  // CHROME_BROWSER_PROTECTOR_PROTECTOR_UTILS_H_