Remove the concept of currentItemIndex

ios/web/public/test/fakes/test_navigation_manager.h

Index: ios/web/public/test/fakes/test_navigation_manager.h
diff --git a/ios/web/public/test/fakes/test_navigation_manager.h b/ios/web/public/test/fakes/test_navigation_manager.h
index 53a7ef0aac4f2fafb6e2665aa3870a031487bb10..4f8be46c383ca90a1278eba853bd775091881a43 100644
--- a/ios/web/public/test/fakes/test_navigation_manager.h
+++ b/ios/web/public/test/fakes/test_navigation_manager.h
@@ -31,7 +31,6 @@ class TestNavigationManager : public NavigationManager {
       BrowserURLRewriter::URLRewriter rewriter) override;
   int GetItemCount() const override;
   NavigationItem* GetItemAtIndex(size_t index) const override;
-  int GetCurrentItemIndex() const override;
   int GetPendingItemIndex() const override;
   int GetLastCommittedItemIndex() const override;
   bool RemoveItemAtIndex(int index) override;
@@ -63,9 +62,9 @@ class TestNavigationManager : public NavigationManager {
   // GetItemAtIndex(), and GetCurrentItemIndex().
   void AddItem(const GURL& url, ui::PageTransition transition);
 
-  // Sets the index to be returned by GetCurrentItemIndex(). |index| must be
-  // either -1 or between 0 and GetItemCount()-1, inclusively.
-  void SetCurrentItemIndex(const int index);
+  // Sets the index to be returned by GetLastCommittedItemIndex(). |index| must
+  // be either -1 or between 0 and GetItemCount()-1, inclusively.
+  void SetLastCommittedItemIndex(const int index);
 
  private:
   // A list of items constructed by calling AddItem().