[Navigation Experiment] Add WKBasedNavigationManagerImpl.

ios/web/test/fakes/test_navigation_manager_delegate.h

Index: ios/web/test/fakes/test_navigation_manager_delegate.h
diff --git a/ios/web/test/fakes/test_navigation_manager_delegate.h b/ios/web/test/fakes/test_navigation_manager_delegate.h
index 53804fb6ad58f194aa91fff3a8345e221daa5ece..ae9feafa34d3ee96562d6cf1da601047ca65cbaa 100644
--- a/ios/web/test/fakes/test_navigation_manager_delegate.h
+++ b/ios/web/test/fakes/test_navigation_manager_delegate.h
@@ -7,7 +7,10 @@
 
 #import "ios/web/navigation/navigation_manager_delegate.h"
 
+@protocol WebViewNavigationProxy;
+
 namespace web {
+class WebViewNavigationProxy;
 
 class TestNavigationManagerDelegate : public NavigationManagerDelegate {
  public:
@@ -19,6 +22,7 @@ class TestNavigationManagerDelegate : public NavigationManagerDelegate {
   void OnNavigationItemCommitted(
       const LoadCommittedDetails& load_details) override;
   WebState* GetWebState() override;
+  id<WebViewNavigationProxy> GetWebViewNavigationProxy() const override;
 };
 
 }  // namespace web