Added some public methods to web::NavigationController.

ios/web/navigation/navigation_manager_impl.h

Index: ios/web/navigation/navigation_manager_impl.h
diff --git a/ios/web/navigation/navigation_manager_impl.h b/ios/web/navigation/navigation_manager_impl.h
index 1433e6e88c96b53ce3f591042a908354909ccf95..820071b0207ecfb8d9dafa3367440b6dddeae5c2 100644
--- a/ios/web/navigation/navigation_manager_impl.h
+++ b/ios/web/navigation/navigation_manager_impl.h
@@ -73,16 +73,11 @@ class NavigationManagerImpl : public NavigationManager {
   // by the navigation manager and may be deleted at any time.
   NavigationItem* GetTransientItem() const;
 
-  // Returns the committed NavigationItem at |index|.
-  NavigationItem* GetItemAtIndex(size_t index) const;
-
   // Temporary accessors and content/ class pass-throughs.
   // TODO(stuartmorgan): Re-evaluate this list once the refactorings have
   // settled down.
   CRWSessionController* GetSessionController();
-  int GetCurrentEntryIndex() const;
   int GetLastCommittedEntryIndex() const;
-  int GetEntryCount() const;
   bool RemoveEntryAtIndex(int index);
   int GetPendingEntryIndex() const;
   void LoadURL(const GURL& url,
@@ -115,6 +110,9 @@ class NavigationManagerImpl : public NavigationManager {
   void DiscardNonCommittedItems() override;
   void AddTransientURLRewriter(
       BrowserURLRewriter::URLRewriter rewriter) override;
+  int GetEntryCount() const override;
+  NavigationItem* GetItemAtIndex(size_t index) const override;
+  int GetCurrentEntryIndex() const override;
 
   // Returns the current list of transient url rewriters, passing ownership to
   // the caller.