Remove usage of Tab's |url| property from TabModel.

ios/chrome/browser/tabs/tab_model_unittest.mm

Index: ios/chrome/browser/tabs/tab_model_unittest.mm
diff --git a/ios/chrome/browser/tabs/tab_model_unittest.mm b/ios/chrome/browser/tabs/tab_model_unittest.mm
index 004cc4f7e099d7df94f3666a210e36467687f493..9857518413c0607426a363777c53437d508c4acf 100644
--- a/ios/chrome/browser/tabs/tab_model_unittest.mm
+++ b/ios/chrome/browser/tabs/tab_model_unittest.mm
@@ -349,6 +349,8 @@ void SetTabModel(TabModel* tab_model) {
                               openedByDOM:NO
                                   atIndex:0
                              inBackground:NO];
+  web::WebStateImpl* web_state = static_cast<web::WebStateImpl*>(tab.webState);
+  web_state->GetNavigationManagerImpl().CommitPendingItem();
 
   SessionWindowIOS* window(CreateSessionWindow());
   [tab_model_ restoreSessionWindow:window];
@@ -368,6 +370,8 @@ void SetTabModel(TabModel* tab_model) {
                                openedByDOM:NO
                                    atIndex:0
                               inBackground:NO];
+  web::WebStateImpl* web_state = static_cast<web::WebStateImpl*>(tab0.webState);
+  web_state->GetNavigationManagerImpl().CommitPendingItem();
   Tab* tab1 = [tab_model_ insertTabWithURL:GURL(kChromeUINewTabURL)
                                   referrer:web::Referrer()
                                 transition:ui::PAGE_TRANSITION_TYPED
@@ -375,6 +379,8 @@ void SetTabModel(TabModel* tab_model) {
                                openedByDOM:NO
                                    atIndex:1
                               inBackground:NO];
+  web_state = static_cast<web::WebStateImpl*>(tab1.webState);
+  web_state->GetNavigationManagerImpl().CommitPendingItem();
 
   SessionWindowIOS* window(CreateSessionWindow());
   [tab_model_ restoreSessionWindow:window];
@@ -399,6 +405,8 @@ void SetTabModel(TabModel* tab_model) {
                               openedByDOM:NO
                                   atIndex:0
                              inBackground:NO];
+  web::WebStateImpl* web_state = static_cast<web::WebStateImpl*>(tab.webState);
+  web_state->GetNavigationManagerImpl().CommitPendingItem();
 
   SessionWindowIOS* window(CreateSessionWindow());
   [tab_model_ restoreSessionWindow:window];