sync: Finish non-blocking type encryption support

sync/engine/cryptographer_provider.cc

-// Copyright 2014 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/engine/cryptographer_provider.h"
-
-namespace syncer {
-
-CryptographerProvider::CryptographerProvider() {
-}
-
-CryptographerProvider::~CryptographerProvider() {
-}
-
-ScopedCryptographerRef::ScopedCryptographerRef() {
-}
-
-ScopedCryptographerRef::~ScopedCryptographerRef() {
-}
-
-bool ScopedCryptographerRef::Initialize(ScopedCryptographerInternal* impl) {
-  scoped_cryptographer_internal_.reset(impl);
-  return IsValid();
-}
-
-bool ScopedCryptographerRef::IsValid() const {
-  return !!Get();
-}
-
-Cryptographer* ScopedCryptographerRef::Get() const {
-  if (!scoped_cryptographer_internal_)
-    return NULL;
-  return scoped_cryptographer_internal_->Get();
-}
-
-ScopedCryptographerInternal::ScopedCryptographerInternal() {
-}
-
-ScopedCryptographerInternal::~ScopedCryptographerInternal() {
-}
-
-}  // namespace syncer