Exclude ProtectorService code from Android build.

chrome/browser/protector/protector_service.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_SERVICE_H_
 #define CHROME_BROWSER_PROTECTOR_PROTECTOR_SERVICE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 112 matching lines @@
   // True if there is a change that has been shown and not yet accepted or
   // discarded by user.
   bool has_active_change_;
 
   // Observes changes to protected prefs and updates the backup.
   scoped_ptr<ProtectedPrefsWatcher> prefs_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ProtectorService);
 };
 
-// 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_SERVICE_H_