Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/history/history_client_impl.cc

 // Copyright 2015 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 "ios/chrome/browser/history/history_client_impl.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/history/core/browser/history_service.h"
 #include "ios/chrome/browser/history/history_backend_client_impl.h"
 #include "ios/chrome/browser/history/history_utils.h"
 #include "url/gurl.h"
 
 HistoryClientImpl::HistoryClientImpl(bookmarks::BookmarkModel* bookmark_model)
     : bookmark_model_(bookmark_model), is_bookmark_model_observer_(false) {
 }
 
@@ skipping 35 matching lines @@
   }
 }
 
 bool HistoryClientImpl::CanAddURL(const GURL& url) {
   return ios::CanAddURLToHistory(url);
 }
 
 void HistoryClientImpl::NotifyProfileError(sql::InitStatus init_status) {
 }
 
-scoped_ptr<history::HistoryBackendClient>
+std::unique_ptr<history::HistoryBackendClient>
 HistoryClientImpl::CreateBackendClient() {
-  return make_scoped_ptr(new HistoryBackendClientImpl(bookmark_model_));
+  return base::WrapUnique(new HistoryBackendClientImpl(bookmark_model_));
 }
 
 void HistoryClientImpl::BookmarkModelChanged() {
 }
 
 void HistoryClientImpl::BookmarkNodeRemoved(
     bookmarks::BookmarkModel* model,
     const bookmarks::BookmarkNode* parent,
     int old_index,
     const bookmarks::BookmarkNode* node,
     const std::set<GURL>& no_longer_bookmarked) {
   if (!on_bookmarks_removed_.is_null())
     on_bookmarks_removed_.Run(no_longer_bookmarked);
 }
 
 void HistoryClientImpl::BookmarkAllUserNodesRemoved(
     bookmarks::BookmarkModel* model,
     const std::set<GURL>& removed_urls) {
   if (!on_bookmarks_removed_.is_null())
     on_bookmarks_removed_.Run(removed_urls);
 }