[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..4fce6b5f2f7939b723c30b0080c82adf4f4f6702 100644
--- a/ios/web/test/fakes/test_navigation_manager_delegate.h
+++ b/ios/web/test/fakes/test_navigation_manager_delegate.h
@@ -7,6 +7,8 @@
 
 #import "ios/web/navigation/navigation_manager_delegate.h"
 
+@protocol CRWWebViewNavigationProxy;
+
 namespace web {
 
 class TestNavigationManagerDelegate : public NavigationManagerDelegate {
@@ -19,6 +21,7 @@ class TestNavigationManagerDelegate : public NavigationManagerDelegate {
   void OnNavigationItemCommitted(
       const LoadCommittedDetails& load_details) override;
   WebState* GetWebState() override;
+  id<CRWWebViewNavigationProxy> GetWebViewNavigationProxy() const override;
 };
 
 }  // namespace web