Fix crashes when using translate in incognito by overriding some methods.

ios/web_view/internal/translate/web_view_translate_ranker_factory.cc

Index: ios/web_view/internal/translate/web_view_translate_ranker_factory.cc
diff --git a/ios/web_view/internal/translate/web_view_translate_ranker_factory.cc b/ios/web_view/internal/translate/web_view_translate_ranker_factory.cc
index 8c701968a8f4363484c736e59785cbc177f9c1cb..4efa9191724ca791b1f1e7abc365ce5ca88d794d 100644
--- a/ios/web_view/internal/translate/web_view_translate_ranker_factory.cc
+++ b/ios/web_view/internal/translate/web_view_translate_ranker_factory.cc
@@ -53,4 +53,10 @@ WebViewTranslateRankerFactory::BuildServiceInstanceFor(
   return std::move(ranker);
 }
 
+web::BrowserState* WebViewTranslateRankerFactory::GetBrowserStateToUse(
+    web::BrowserState* context) const {
+  // Override to enable this service for off the record browser states.
+  return context;
+}
+
 }  // namespace ios_web_view