Don't send machine and user ID to Omaha anymore. Send a/r pings instead.

prefs.h

 // Copyright (c) 2010 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_PREFS_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_PREFS_H__
 
 #include "base/file_path.h"
 #include "gtest/gtest_prod.h"  // for FRIEND_TEST
 #include "update_engine/prefs_interface.h"
 
 namespace chromeos_update_engine {
 
 // Implements a preference store by storing the value associated with
 // a key in a separate file named after the key under a preference
 // store directory.
 
 class Prefs : public PrefsInterface {
  public:
+  Prefs() {}
+
   // Initializes the store by associating this object with |prefs_dir|
   // as the preference store directory. Returns true on success, false
   // otherwise.
   bool Init(const FilePath& prefs_dir);
 
   // PrefsInterface methods.
   bool GetString(const std::string& key, std::string* value);
   bool SetString(const std::string& key, const std::string& value);
   bool GetInt64(const std::string& key, int64_t* value);
   bool SetInt64(const std::string& key, const int64_t value);
 
  private:
   FRIEND_TEST(PrefsTest, GetFileNameForKey);
   FRIEND_TEST(PrefsTest, GetFileNameForKeyBadCharacter);
   FRIEND_TEST(PrefsTest, GetFileNameForKeyEmpty);
 
   // Sets |filename| to the full path to the file containing the data
   // associated with |key|. Returns true on success, false otherwise.
   bool GetFileNameForKey(const std::string& key, FilePath* filename);
 
   // Preference store directory.
   FilePath prefs_dir_;
+
+  DISALLOW_COPY_AND_ASSIGN(Prefs);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_PREFS_H__