Moved NavigationManagerImpl serialization out of CRWSessionController.

ios/web/public/test/fakes/test_web_state.mm

 // Copyright 2014 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.
 
 #import "ios/web/public/test/fakes/test_web_state.h"
 
 #include <stdint.h>
 
 #include "base/callback.h"
 #include "ios/web/public/web_state/web_state_observer.h"
@@ skipping 50 matching lines @@
 }
 
 const NavigationManager* TestWebState::GetNavigationManager() const {
   return navigation_manager_.get();
 }
 
 NavigationManager* TestWebState::GetNavigationManager() {
   return navigation_manager_.get();
 }
 
+CRWNavigationManagerSerialization*
+TestWebState::BuildSerializedNavigationManager() {
+  return nil;
+}
+
 void TestWebState::SetNavigationManager(
     std::unique_ptr<NavigationManager> navigation_manager) {
   navigation_manager_ = std::move(navigation_manager);
 }
 
 void TestWebState::SetView(UIView* view) {
   view_.reset([view retain]);
 }
 
 CRWJSInjectionReceiver* TestWebState::GetJSInjectionReceiver() const {
@@ skipping 109 matching lines @@
 service_manager::InterfaceRegistry* TestWebState::GetMojoInterfaceRegistry() {
   return nullptr;
 }
 
 base::WeakPtr<WebState> TestWebState::AsWeakPtr() {
   NOTREACHED();
   return base::WeakPtr<WebState>();
 }
 
 }  // namespace web