Moved NavigationManagerImpl serialization out of CRWSessionController.

ios/web/navigation/navigation_manager_impl_unittest.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/navigation/navigation_manager_impl.h"
 
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
 #import "ios/web/navigation/crw_session_controller+private_constructors.h"
 #import "ios/web/navigation/navigation_manager_delegate.h"
@@ skipping 10 matching lines @@
   void OnNavigationItemsPruned(size_t pruned_item_count) override {}
   void OnNavigationItemChanged() override{};
   void OnNavigationItemCommitted(const LoadCommittedDetails&) override {}
   WebState* GetWebState() override { return nullptr; }
 };
 }  // namespace
 
 // Test fixture for NavigationManagerImpl testing.
 class NavigationManagerTest : public PlatformTest {
  protected:
-  NavigationManagerTest()
-      : manager_(new NavigationManagerImpl(&delegate_, &browser_state_)) {
+  NavigationManagerTest() : manager_(new NavigationManagerImpl()) {
+    manager_->SetDelegate(&delegate_);
+    manager_->SetBrowserState(&browser_state_);
     controller_.reset([[CRWSessionController alloc]
            initWithWindowName:nil
                      openerId:nil
                   openedByDOM:NO
         openerNavigationIndex:0
                  browserState:&browser_state_]);
     manager_->SetSessionController(controller_.get());
   }
   CRWSessionController* session_controller() { return controller_.get(); }
   NavigationManagerImpl* navigation_manager() { return manager_.get(); }
@@ skipping 479 matching lines @@
   [session_controller() goToEntryAtIndex:0];
   [session_controller() setPendingEntryIndex:1];
   ASSERT_EQ(3, navigation_manager()->GetItemCount());
   ASSERT_EQ(0, navigation_manager()->GetCurrentItemIndex());
   ASSERT_EQ(1, navigation_manager()->GetPendingItemIndex());
   EXPECT_EQ(2, navigation_manager()->GetIndexForOffset(1));
   EXPECT_EQ(0, navigation_manager()->GetIndexForOffset(-1));
 }
 
 }  // namespace web