AU: Use Omaha ID rather than MAC address in delta updater

src/platform/update_engine/test_utils.h

 // Copyright (c) 2009 The Chromium OS 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 CHROMEOS_PLATFORM_UPDATE_ENGINE_TEST_UTILS_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_TEST_UTILS_H__
 
 #include <set>
 #include <string>
 #include <vector>
 #include <gtest/gtest.h>
 #include "update_engine/action.h"
 
 // These are some handy functions for unittests.
 
 namespace chromeos_update_engine {
 
 // Writes the data passed to path. The file at path will be overwritten if it
 // exists. Returns true on success, false otherwise.
-bool WriteFile(const char* path, const char* data, int data_len);
 bool WriteFileVector(const std::string& path, const std::vector<char>& data);
 bool WriteFileString(const std::string& path, const std::string& data);
 
 // Returns the size of the file at path. If the file doesn't exist or some
 // error occurrs, -1 is returned.
 off_t FileSize(const std::string& path);
 
 // Reads a symlink from disk. Returns empty string on failure.
 std::string Readlink(const std::string& path);
 
@@ skipping 139 matching lines @@
   static std::string StaticType() { return "ObjectCollectorAction"; }
   std::string Type() const { return StaticType(); }
   const T& object() const { return object_; }
  private:
   T object_;
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_TEST_UTILS_H__