Make Encryptor a component. Used by //chrome and (soon) //components/webdata.

chrome/browser/password_manager/encryptor_password_mac.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_PASSWORD_MANAGER_ENCRYPTOR_PASSWORD_H__
-#define CHROME_BROWSER_PASSWORD_MANAGER_ENCRYPTOR_PASSWORD_H__
-
-#include <string>
-
-#include "base/basictypes.h"
-
-namespace crypto {
-class AppleKeychain;
-}  // namespace crypto
-
-class EncryptorPassword {
- public:
-  explicit EncryptorPassword(const crypto::AppleKeychain& keychain)
-      : keychain_(keychain) {
-  }
-
-  // Get the Encryptor password for this system.  If no password exists
-  // in the Keychain then one is generated, stored in the Mac keychain, and
-  // returned.
-  // If one exists then it is fetched from the Keychain and returned.
-  // If the user disallows access to the Keychain (or an error occurs) then an
-  // empty string is returned.
-  std::string GetEncryptorPassword() const;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(EncryptorPassword);
-  const crypto::AppleKeychain& keychain_;
-};
-
-#endif  // CHROME_BROWSER_PASSWORD_MANAGER_ENCRYPTOR_PASSWORD_H__