Convert ExtensionOptionsGuest to use the new navigation callbacks.

extensions/browser/guest_view/extension_options/extension_options_guest.h

Index: extensions/browser/guest_view/extension_options/extension_options_guest.h
diff --git a/extensions/browser/guest_view/extension_options/extension_options_guest.h b/extensions/browser/guest_view/extension_options/extension_options_guest.h
index 5b0505c9b1d681bebd402e231c99f858c666f0e1..b3b714e4d077cb67e85438e37b4ec7bc545e2c2c 100644
--- a/extensions/browser/guest_view/extension_options/extension_options_guest.h
+++ b/extensions/browser/guest_view/extension_options/extension_options_guest.h
@@ -57,8 +57,7 @@ class ExtensionOptionsGuest
       content::SessionStorageNamespace* session_storage_namespace) final;
 
   // content::WebContentsObserver implementation.
-  void DidNavigateMainFrame(const content::LoadCommittedDetails& details,
-                            const content::FrameNavigateParams& params) final;
+  void DidFinishNavigation(content::NavigationHandle* navigation_handle) final;
 
   std::unique_ptr<extensions::ExtensionOptionsGuestDelegate>
       extension_options_guest_delegate_;