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

components/sessions/core/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/tab_restore_service.h"
 
 namespace sessions {
 
 // TimeFactory-----------------------------------------------------------------
 
 TabRestoreService::TimeFactory::~TimeFactory() {}
 
 // Entry ----------------------------------------------------------------------
 
 // ID of the next Entry.
 static SessionID::id_type next_entry_id = 1;
 
-TabRestoreService::Entry::Entry()
-    : id(next_entry_id++),
-      type(TAB),
-      from_last_session(false) {}
+TabRestoreService::Entry::Entry() : id(next_entry_id++) {}
+TabRestoreService::Entry::~Entry() = default;
 
-TabRestoreService::Entry::Entry(Type type)
-    : id(next_entry_id++),
-      type(type),
-      from_last_session(false) {}
-
-TabRestoreService::Entry::~Entry() {}
-
-// Tab ------------------------------------------------------------------------
-
-TabRestoreService::Tab::Tab()
-    : Entry(TAB),
-      current_navigation_index(-1),
-      browser_id(0),
-      tabstrip_index(-1),
-      pinned(false) {
+TabRestoreService::Tab::Tab() = default;
+TabRestoreService::Tab::~Tab() = default;
+TabRestoreService::Type TabRestoreService::Tab::type() const {
+  return TAB;
 }
 
-TabRestoreService::Tab::Tab(const TabRestoreService::Tab& tab)
-    : Entry(tab),
-      navigations(tab.navigations),
-      current_navigation_index(tab.current_navigation_index),
-      browser_id(tab.browser_id),
-      tabstrip_index(tab.tabstrip_index),
-      pinned(tab.pinned),
-      extension_app_id(tab.extension_app_id),
-      user_agent_override(tab.user_agent_override) {
-  if (tab.platform_data)
-    platform_data = tab.platform_data->Clone();
-}
-
-TabRestoreService::Tab::~Tab() {
-}
-
-TabRestoreService::Tab& TabRestoreService::Tab::operator=(
-    const TabRestoreService::Tab& tab) {
-  id = tab.id;
-  type = tab.type;
-  timestamp = tab.timestamp;
-  from_last_session = tab.from_last_session;
-  navigations = tab.navigations;
-  current_navigation_index = tab.current_navigation_index;
-  browser_id = tab.browser_id;
-  tabstrip_index = tab.tabstrip_index;
-  pinned = tab.pinned;
-  extension_app_id = tab.extension_app_id;
-  user_agent_override = tab.user_agent_override;
-
-  if (tab.platform_data)
-    platform_data = tab.platform_data->Clone();
-
-  return *this;
-}
-
-// Window ---------------------------------------------------------------------
-
-TabRestoreService::Window::Window() : Entry(WINDOW), selected_tab_index(-1) {
-}
-
-TabRestoreService::Window::~Window() {
+TabRestoreService::Window::Window() = default;
+TabRestoreService::Window::~Window() = default;
+TabRestoreService::Type TabRestoreService::Window::type() const {
+  return WINDOW;
 }
 
 // TabRestoreService ----------------------------------------------------------
 
 TabRestoreService::~TabRestoreService() {
 }
 
 // PlatformSpecificTabData
 // ------------------------------------------------------
 
 PlatformSpecificTabData::~PlatformSpecificTabData() {}
 
 }  // namespace sessions