Replace ptr.reset with std::move in src/components

components/history/core/browser/history_service.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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 950 matching lines @@
     const sync_pb::HistoryDeleteDirectiveSpecifics& delete_directive) {
   DCHECK(thread_checker_.CalledOnValidThread());
   return delete_directive_handler_.ProcessLocalDeleteDirective(
       delete_directive);
 }
 
 void HistoryService::SetInMemoryBackend(
     std::unique_ptr<InMemoryHistoryBackend> mem_backend) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(!in_memory_backend_) << "Setting mem DB twice";
-  in_memory_backend_.reset(mem_backend.release());
+  in_memory_backend_ = std::move(mem_backend);
 
   // The database requires additional initialization once we own it.
   in_memory_backend_->AttachToHistoryService(this);
 }
 
 void HistoryService::NotifyProfileError(sql::InitStatus init_status,
                                         const std::string& diagnostics) {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (history_client_)
     history_client_->NotifyProfileError(init_status, diagnostics);
@@ skipping 160 matching lines @@
   return favicon_changed_callback_list_.Add(callback);
 }
 
 void HistoryService::NotifyFaviconsChanged(const std::set<GURL>& page_urls,
                                            const GURL& icon_url) {
   DCHECK(thread_checker_.CalledOnValidThread());
   favicon_changed_callback_list_.Notify(page_urls, icon_url);
 }
 
 }  // namespace history