Use DidFinishNavigation callback in LanguageDetectionController.

components/translate/ios/browser/language_detection_controller.mm

Index: components/translate/ios/browser/language_detection_controller.mm
diff --git a/components/translate/ios/browser/language_detection_controller.mm b/components/translate/ios/browser/language_detection_controller.mm
index 42922618e9b2f713afe4f2fa44e60f04adbb9b23..53fda593ac110e41e0598d2e511b2b323a19d5d9 100644
--- a/components/translate/ios/browser/language_detection_controller.mm
+++ b/components/translate/ios/browser/language_detection_controller.mm
@@ -16,6 +16,7 @@
 #import "components/translate/ios/browser/js_language_detection_manager.h"
 #include "components/translate/ios/browser/string_clipping_util.h"
 #import "ios/web/public/url_scheme_util.h"
+#include "ios/web/public/web_state/navigation_context.h"
 #include "ios/web/public/web_state/web_state.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ -137,12 +138,10 @@ void LanguageDetectionController::PageLoaded(
     StartLanguageDetection();
 }
 
-void LanguageDetectionController::UrlHashChanged() {
-  StartLanguageDetection();
-}
-
-void LanguageDetectionController::HistoryStateChanged() {
-  StartLanguageDetection();
+void LanguageDetectionController::DidFinishNavigation(
+    web::NavigationContext* navigation_context) {
+  if (navigation_context->IsSamePage())
+    StartLanguageDetection();
 }
 
 void LanguageDetectionController::WebStateDestroyed() {