Updated ownership of NavigationItems within CRWSessionController.

ios/web/navigation/crw_session_controller_unittest.mm

 // Copyright 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.
 
 #import "ios/web/navigation/crw_session_controller.h"
 
 #import <Foundation/Foundation.h>
 
 #include <utility>
 
@@ skipping 790 matching lines @@
   // Push state navigation.
   items.push_back(
       CreateNavigationItem("http://foo.com/bar", "http://foo.com", @"Fifth"));
   // Push state navigation.
   items.push_back(CreateNavigationItem("http://foo.com/bar#bar",
                                        "http://foo.com/bar", @"Sixth"));
   base::scoped_nsobject<CRWSessionController> controller(
       [[CRWSessionController alloc] initWithNavigationItems:std::move(items)
                                                currentIndex:0
                                                browserState:&browser_state_]);
-  web::NavigationItemImpl* item0 =
-      static_cast<web::NavigationItemImpl*>([controller items][0]);
-  web::NavigationItemImpl* item1 =
-      static_cast<web::NavigationItemImpl*>([controller items][1]);
-  web::NavigationItemImpl* item2 =
-      static_cast<web::NavigationItemImpl*>([controller items][2]);
-  web::NavigationItemImpl* item3 =
-      static_cast<web::NavigationItemImpl*>([controller items][3]);
-  web::NavigationItemImpl* item4 =
-      static_cast<web::NavigationItemImpl*>([controller items][4]);
-  web::NavigationItemImpl* item5 =
-      static_cast<web::NavigationItemImpl*>([controller items][5]);
+  web::NavigationItemImpl* item0 = [controller items][0].get();
+  web::NavigationItemImpl* item1 = [controller items][1].get();
+  web::NavigationItemImpl* item2 = [controller items][2].get();
+  web::NavigationItemImpl* item3 = [controller items][3].get();
+  web::NavigationItemImpl* item4 = [controller items][4].get();
+  web::NavigationItemImpl* item5 = [controller items][5].get();
   item1->SetIsCreatedFromPushState(true);
   item4->SetIsCreatedFromHashChange(true);
   item5->SetIsCreatedFromPushState(true);
 
   EXPECT_FALSE(
       [controller isSameDocumentNavigationBetweenItem:item0 andItem:item0]);
   EXPECT_TRUE(
       [controller isSameDocumentNavigationBetweenItem:item0 andItem:item1]);
   EXPECT_TRUE(
       [controller isSameDocumentNavigationBetweenItem:item5 andItem:item3]);
@@ skipping 273 matching lines @@
   [session_controller_ commitPendingItem];
   [session_controller_ addPendingItem:GURL("http://www.example.com/0")
                              referrer:MakeReferrer("http://www.example.com/b")
                            transition:ui::PAGE_TRANSITION_CLIENT_REDIRECT
                     rendererInitiated:YES];
   [session_controller_ commitPendingItem];
   EXPECT_EQ(0U, [session_controller_ backwardEntries].count);
 }
 
 }  // anonymous namespace