Clean up CRWSessionController usage in TabTest and TabModelTest.

ios/chrome/browser/tabs/tab_unittest.mm

Index: ios/chrome/browser/tabs/tab_unittest.mm
diff --git a/ios/chrome/browser/tabs/tab_unittest.mm b/ios/chrome/browser/tabs/tab_unittest.mm
index 6b4f1c02f22239cb1b35795085d740796da36d53..8ff8547b31db594dd0a3d772d24f9c477254be9b 100644
--- a/ios/chrome/browser/tabs/tab_unittest.mm
+++ b/ios/chrome/browser/tabs/tab_unittest.mm
@@ -39,7 +39,6 @@
 #import "ios/public/provider/chrome/browser/native_app_launcher/fake_native_app_whitelist_manager.h"
 #include "ios/public/provider/chrome/browser/test_chrome_browser_provider.h"
 #import "ios/testing/ocmock_complex_type_helper.h"
-#import "ios/web/navigation/crw_session_controller.h"
 #import "ios/web/navigation/navigation_manager_impl.h"
 #include "ios/web/public/navigation_item.h"
 #import "ios/web/public/navigation_manager.h"
@@ -251,7 +250,7 @@ void BrowseTo(const GURL& userUrl, const GURL& redirectUrl, NSString* title) {
             web_state_impl_.get(), redirectUrl,
             ui::PageTransition::PAGE_TRANSITION_TYPED);
     web_state_impl_->OnNavigationStarted(context2.get());
-    [[tab_ navigationManagerImpl]->GetSessionController() commitPendingItem];
+    [tab_ navigationManagerImpl]->CommitPendingItem();
     web_state_impl_->UpdateHttpResponseHeaders(redirectUrl);
     web_state_impl_->OnNavigationFinished(context2.get());