Move the offline URL trimming to GetFormattedURL.

ios/web/public/test/test_navigation_manager.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_WEB_PUBLIC_TEST_TEST_NAVIGATION_MANAGER_H_
 #define IOS_WEB_PUBLIC_TEST_TEST_NAVIGATION_MANAGER_H_
 
 #import "ios/web/public/navigation_manager.h"
 
 namespace web {
@@ skipping 25 matching lines @@
   bool CanGoForward() const override;
   bool CanGoToOffset(int offset) const override;
   void GoBack() override;
   void GoForward() override;
   void GoToIndex(int index) override;
   void Reload(bool check_for_reposts) override;
 
   // Setters for test data.
   void SetLastCommittedItem(NavigationItem* item);
   void SetPendingItem(NavigationItem* item);
+  void SetVisibleItem(NavigationItem* item);
 
  private:
   NavigationItem* pending_item_;
   NavigationItem* last_committed_item_;
+  NavigationItem* visible_item_;
 };
 
 }  // namespace web
 
 #endif