Add Mac implementations of new SymmetricKey and Encryptor classes.

base/crypto/symmetric_key_win.cc

 // Copyright (c) 2010 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.
 
 #include "base/crypto/symmetric_key.h"
 
 namespace base {
 
 // TODO(albertb): Implement on Windows.
 
 // static
-SymmetricKey* SymmetricKey::GenerateRandomKey(Algorithm algorithm, unsigned int key_size) {
+SymmetricKey* SymmetricKey::GenerateRandomKey(Algorithm algorithm,
+                                              size_t key_size_in_bits) {
   return NULL;
 }
 
 // static
 SymmetricKey* SymmetricKey::DeriveKeyFromPassword(Algorithm algorithm,
                                                   const std::string& password,
                                                   const std::string& salt,
                                                   size_t iterations,
-                                                  size_t key_size) {
+                                                  size_t key_size_in_bits) {
   return NULL;
 }
 
 bool SymmetricKey::GetRawKey(std::string* raw_key) {
   return false;
 }
 
 }  // namespace base