Remove -insertTabWithWebState:atIndex: from TabModel.

ios/web/navigation/crw_session_controller_unittest.mm

Index: ios/web/navigation/crw_session_controller_unittest.mm
diff --git a/ios/web/navigation/crw_session_controller_unittest.mm b/ios/web/navigation/crw_session_controller_unittest.mm
index 16d984bf1fd38d62a69c435c54262b969aafd83f..96cb5df650abe1adf63d95430198c607a10a08a3 100644
--- a/ios/web/navigation/crw_session_controller_unittest.mm
+++ b/ios/web/navigation/crw_session_controller_unittest.mm
@@ -688,7 +688,7 @@ std::unique_ptr<web::NavigationItemImpl> CreateNavigationItem(
 }
 
 TEST_F(CRWSessionControllerTest, CreateWithEmptyNavigations) {
-  std::vector<std::unique_ptr<web::NavigationItem>> items;
+  web::ScopedNavigationItemList items;
   base::scoped_nsobject<CRWSessionController> controller(
       [[CRWSessionController alloc] initWithBrowserState:&browser_state_
                                          navigationItems:std::move(items)
@@ -700,7 +700,7 @@ TEST_F(CRWSessionControllerTest, CreateWithEmptyNavigations) {
 }
 
 TEST_F(CRWSessionControllerTest, CreateWithNavList) {
-  std::vector<std::unique_ptr<web::NavigationItem>> items;
+  web::ScopedNavigationItemList items;
   items.push_back(CreateNavigationItem("http://www.google.com",
                                        "http://www.referrer.com", @"Google"));
   items.push_back(CreateNavigationItem("http://www.yahoo.com",
@@ -762,7 +762,7 @@ TEST_F(CRWSessionControllerTest, PreviousNavigationEntry) {
 }
 
 TEST_F(CRWSessionControllerTest, PushNewEntry) {
-  std::vector<std::unique_ptr<web::NavigationItem>> items;
+  web::ScopedNavigationItemList items;
   items.push_back(CreateNavigationItem("http://www.firstpage.com",
                                        "http://www.starturl.com", @"First"));
   items.push_back(CreateNavigationItem("http://www.secondpage.com",
@@ -805,7 +805,7 @@ TEST_F(CRWSessionControllerTest, PushNewEntry) {
 }
 
 TEST_F(CRWSessionControllerTest, IsSameDocumentNavigation) {
-  std::vector<std::unique_ptr<web::NavigationItem>> items;
+  web::ScopedNavigationItemList items;
   items.push_back(
       CreateNavigationItem("http://foo.com", "http://google.com", @"First"));
   // Push state navigation.
@@ -858,7 +858,7 @@ TEST_F(CRWSessionControllerTest, IsSameDocumentNavigation) {
 }
 
 TEST_F(CRWSessionControllerTest, UpdateCurrentEntry) {
-  std::vector<std::unique_ptr<web::NavigationItem>> items;
+  web::ScopedNavigationItemList items;
   items.push_back(CreateNavigationItem("http://www.firstpage.com",
                                        "http://www.starturl.com", @"First"));
   items.push_back(CreateNavigationItem("http://www.secondpage.com",