Cleaned up unused methods from WebStateImpl and NavigationContextImpl.

ios/web/web_state/web_state_impl.h

Index: ios/web/web_state/web_state_impl.h
diff --git a/ios/web/web_state/web_state_impl.h b/ios/web/web_state/web_state_impl.h
index 3ec75465960ef1aaa94bd6b2643b207713a5409a..0c256d36febf7e12713790397d3d5158aab8f00c 100644
--- a/ios/web/web_state/web_state_impl.h
+++ b/ios/web/web_state/web_state_impl.h
@@ -79,15 +79,6 @@ class WebStateImpl : public WebState, public NavigationManagerDelegate {
   // Called when a navigation is finished.
   void OnNavigationFinished(web::NavigationContext* context);
 
-  // Called when a navigation is committed.
-  void OnNavigationCommitted(const GURL& url);
-
-  // Notifies the observers that same page navigation did finish.
-  void OnSameDocumentNavigation(const GURL& url);
-
-  // Notifies the observers that navigation to error page did finish.
-  void OnErrorPageNavigation(const GURL& url);
-
   // Called when page title was changed.
   void OnTitleChanged();