Make TabRestoreService::Entry noncopyable and fix up surrounding code.

components/sessions/core/in_memory_tab_restore_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.
 
 #include "components/sessions/core/in_memory_tab_restore_service.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 37 matching lines @@
 
 const TabRestoreService::Entries& InMemoryTabRestoreService::entries() const {
   return helper_.entries();
 }
 
 std::vector<LiveTab*> InMemoryTabRestoreService::RestoreMostRecentEntry(
     LiveTabContext* context) {
   return helper_.RestoreMostRecentEntry(context);
 }
 
-TabRestoreService::Tab* InMemoryTabRestoreService::RemoveTabEntryById(
-    SessionID::id_type id) {
+std::unique_ptr<TabRestoreService::Tab>
+InMemoryTabRestoreService::RemoveTabEntryById(SessionID::id_type id) {
   return helper_.RemoveTabEntryById(id);
 }
 
 std::vector<LiveTab*> InMemoryTabRestoreService::RestoreEntryById(
     LiveTabContext* context,
     SessionID::id_type id,
     WindowOpenDisposition disposition) {
   return helper_.RestoreEntryById(context, id, disposition);
 }
 
 void InMemoryTabRestoreService::LoadTabsFromLastSession() {
   // Do nothing. This relies on tab persistence which is implemented in Java on
   // the application side on Android.
 }
 
 bool InMemoryTabRestoreService::IsLoaded() const {
   // See comment above.
   return true;
 }
 
 void InMemoryTabRestoreService::DeleteLastSession() {
   // See comment above.
 }
 
 void InMemoryTabRestoreService::Shutdown() {
 }
 
 }  // namespace