Refactor web shell integration tests utilities.

ios/web/public/test/navigation_test_util.mm

Index: ios/web/public/test/navigation_test_util.mm
diff --git a/ios/web/shell/test/navigation_test_util.mm b/ios/web/public/test/navigation_test_util.mm
similarity index 60%
rename from ios/web/shell/test/navigation_test_util.mm
rename to ios/web/public/test/navigation_test_util.mm
index a306ad242514e33d9a89f3b41ec21229d7466da4..a1046485dc1344de8624eb54bf96e201ca25add0 100644
--- a/ios/web/shell/test/navigation_test_util.mm
+++ b/ios/web/public/test/navigation_test_util.mm
@@ -2,11 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ios/web/shell/test/navigation_test_util.h"
+#include "ios/web/public/test/navigation_test_util.h"
 
 #import "ios/web/public/navigation_manager.h"
-#import "ios/web/public/web_state/web_state.h"
-#import "ios/web/shell/test/web_shell_test_util.h"
 
 using web::NavigationManager;
 
@@ -15,12 +13,8 @@ namespace navigation_test_util {
 // TODO(crbug.com/604902): Refactor these utilities into objects that can be
 // shared accross the web shell and Chrome.
 
-void LoadUrl(GURL url) {
-  ViewController* view_controller =
-      web::web_shell_test_util::GetCurrentViewController();
-
-  NavigationManager* navigation_manager =
-      [view_controller webState]->GetNavigationManager();
+void LoadUrl(web::WebState* web_state, GURL url) {
+  NavigationManager* navigation_manager = web_state->GetNavigationManager();
   NavigationManager::WebLoadParams params(url);
   params.transition_type = ui::PAGE_TRANSITION_TYPED;
   navigation_manager->LoadURLWithParams(params);