Clean up CRWSessionController usage in TabTest and TabModelTest.

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 9857518413c0607426a363777c53437d508c4acf..e1131973277c9d605c2a112099c939b39f67ba2b 100644
--- a/ios/chrome/browser/tabs/tab_model_unittest.mm
+++ b/ios/chrome/browser/tabs/tab_model_unittest.mm
@@ -25,7 +25,6 @@
 #import "ios/chrome/browser/web/chrome_web_client.h"
 #import "ios/chrome/browser/web_state_list/web_state_list.h"
 #include "ios/chrome/test/ios_chrome_scoped_testing_chrome_browser_state_manager.h"
-#import "ios/web/navigation/crw_session_controller.h"
 #import "ios/web/navigation/navigation_manager_impl.h"
 #import "ios/web/public/crw_session_storage.h"
 #import "ios/web/public/navigation_manager.h"
@@ -846,7 +845,7 @@ void SetTabModel(TabModel* tab_model) {
                                 inBackground:NO];
   // Force the history to update, as it is used to determine grouping.
   ASSERT_TRUE([parent navigationManagerImpl]);
-  [[parent navigationManagerImpl]->GetSessionController() commitPendingItem];
+  [parent navigationManagerImpl]->CommitPendingItem();
   [tab_model_ insertTabWithURL:GURL(kURL1)
                       referrer:web::Referrer()
                     transition:ui::PAGE_TRANSITION_TYPED
@@ -894,7 +893,7 @@ void SetTabModel(TabModel* tab_model) {
   parent_params.transition_type = ui::PAGE_TRANSITION_TYPED;
   [parent navigationManager]->LoadURLWithParams(parent_params);
   ASSERT_TRUE([parent navigationManagerImpl]);
-  [[parent navigationManagerImpl]->GetSessionController() commitPendingItem];
+  [parent navigationManagerImpl]->CommitPendingItem();
   EXPECT_EQ([tab_model_ indexOfTab:parent], 0U);
 
   // Add a new tab. It should be added behind the parent. It should not be added
@@ -947,7 +946,7 @@ void SetTabModel(TabModel* tab_model) {
                                 inBackground:NO];
   // Force the history to update, as it is used to determine grouping.
   ASSERT_TRUE([parent navigationManagerImpl]);
-  [[parent navigationManagerImpl]->GetSessionController() commitPendingItem];
+  [parent navigationManagerImpl]->CommitPendingItem();
   [tab_model_ insertTabWithURL:GURL(kURL1)
                       referrer:web::Referrer()
                     transition:ui::PAGE_TRANSITION_TYPED