Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/test/null_sync_context_proxy.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/internal_api/public/test/null_sync_context_proxy.h"
 
 #include "sync/internal_api/public/activation_context.h"
 
 namespace syncer_v2 {
 
 NullSyncContextProxy::NullSyncContextProxy() {
 }
 
 NullSyncContextProxy::~NullSyncContextProxy() {
 }
 
 void NullSyncContextProxy::ConnectTypeToSync(
     syncer::ModelType type,
-    scoped_ptr<ActivationContext> activation_context) {
+    std::unique_ptr<ActivationContext> activation_context) {
   NOTREACHED() << "NullSyncContextProxy is not meant to be used";
 }
 
 void NullSyncContextProxy::Disconnect(syncer::ModelType type) {
   NOTREACHED() << "NullSyncContextProxy is not meant to be used";
 }
 
-scoped_ptr<SyncContextProxy> NullSyncContextProxy::Clone() const {
-  return scoped_ptr<SyncContextProxy>(new NullSyncContextProxy());
+std::unique_ptr<SyncContextProxy> NullSyncContextProxy::Clone() const {
+  return std::unique_ptr<SyncContextProxy>(new NullSyncContextProxy());
 }
 
 }  // namespace syncer_v2