Make base::Base64Encode() return void

sync/test/fake_encryptor.cc

 // 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.
 
 #include "sync/test/fake_encryptor.h"
 
 #include "base/base64.h"
 
 namespace syncer {
 
 FakeEncryptor::~FakeEncryptor() {}
 
 bool FakeEncryptor::EncryptString(const std::string& plaintext,
                                   std::string* ciphertext) {
-  return base::Base64Encode(plaintext, ciphertext);
+  base::Base64Encode(plaintext, ciphertext);
+  return true;
 }
 
 bool FakeEncryptor::DecryptString(const std::string& ciphertext,
                                   std::string* plaintext) {
   return base::Base64Decode(ciphertext, plaintext);
 }
 
 }  // namespace syncer