Moved NavigationManagerImpl serialization out of CRWSessionController.

ios/web/navigation/navigation_manager_impl.mm

 // Copyright 2013 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/web/navigation/navigation_manager_impl.h"
 
 #include "base/logging.h"
 #import "ios/web/navigation/crw_session_controller+private_constructors.h"
 #import "ios/web/navigation/crw_session_controller.h"
 #import "ios/web/navigation/crw_session_entry.h"
@@ skipping 16 matching lines @@
   url::Replacements<char> replacements;
   replacements.ClearRef();
   return existing_url.ReplaceComponents(replacements) ==
       new_url.ReplaceComponents(replacements);
 }
 
 }  // anonymous namespace
 
 namespace web {
 
-NavigationManagerImpl::NavigationManagerImpl(
-    NavigationManagerDelegate* delegate,
-    BrowserState* browser_state)
-    : delegate_(delegate),
-      browser_state_(browser_state),
-      facade_delegate_(nullptr) {
-  DCHECK(browser_state_);
+NavigationManagerImpl::NavigationManagerImpl()
+    : delegate_(nullptr), browser_state_(nullptr), facade_delegate_(nullptr) {}
+
+NavigationManagerImpl::NavigationManagerImpl(const NavigationManagerImpl& other)
+    : delegate_(nullptr),
+      browser_state_(other.browser_state_),
+      session_controller_([other.session_controller_ copy]),
+      facade_delegate_(nullptr) {}
+
+void NavigationManagerImpl::SetDelegate(NavigationManagerDelegate* delegate) {
+  delegate_ = delegate;
+}
+
+void NavigationManagerImpl::SetBrowserState(BrowserState* browser_state) {
+  browser_state_ = browser_state;
 }
 
 NavigationManagerImpl::~NavigationManagerImpl() {
   // The facade layer should be deleted before this object.
   DCHECK(!facade_delegate_);
 
   [session_controller_ setNavigationManager:nullptr];
 }
 
 CRWSessionController* NavigationManagerImpl::GetSessionController() {
@@ skipping 20 matching lines @@
 
 void NavigationManagerImpl::ReplaceSessionHistory(
     ScopedVector<web::NavigationItem> items,
     int current_index) {
   SetSessionController([[[CRWSessionController alloc]
       initWithNavigationItems:items.Pass()
                  currentIndex:current_index
                  browserState:browser_state_] autorelease]);
 }
 
+scoped_ptr<NavigationManagerImpl> NavigationManagerImpl::CopyForSerialization()
+    const {
+  return scoped_ptr<NavigationManagerImpl>(new NavigationManagerImpl(*this));
+}
+
 void NavigationManagerImpl::SetFacadeDelegate(
     NavigationManagerFacadeDelegate* facade_delegate) {
   facade_delegate_ = facade_delegate;
 }
 
 NavigationManagerFacadeDelegate* NavigationManagerImpl::GetFacadeDelegate()
     const {
   return facade_delegate_;
 }
 
@@ skipping 170 matching lines @@
 }
 
 void NavigationManagerImpl::CopyState(
     NavigationManagerImpl* navigation_manager) {
   SetSessionController(
       [[navigation_manager->GetSessionController() copy] autorelease]);
 }
 
 }  // namespace web