Use DidFinishNavigation callback in LanguageDetectionController.

ios/web/web_state/web_state_observer_bridge.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 
 namespace web {
 
 WebStateObserverBridge::WebStateObserverBridge(web::WebState* webState,
                                                id<CRWWebStateObserver> observer)
@@ skipping 49 matching lines @@
     [observer_ webState:web_state() didLoadPageWithSuccess:success];
   }
 }
 
 void WebStateObserverBridge::InterstitialDismissed() {
   SEL selector = @selector(webStateDidDismissInterstitial:);
   if ([observer_ respondsToSelector:selector])
     [observer_ webStateDidDismissInterstitial:web_state()];
 }
 
-void WebStateObserverBridge::UrlHashChanged() {
-  SEL selector = @selector(webStateDidChangeURLHash:);
-  if ([observer_ respondsToSelector:selector])
-    [observer_ webStateDidChangeURLHash:web_state()];
-}
-
-void WebStateObserverBridge::HistoryStateChanged() {
-  SEL selector = @selector(webStateDidChangeHistoryState:);
-  if ([observer_ respondsToSelector:selector])
-    [observer_ webStateDidChangeHistoryState:web_state()];
-}
-
 void WebStateObserverBridge::LoadProgressChanged(double progress) {
   SEL selector = @selector(webState:didChangeLoadingProgress:);
   if ([observer_ respondsToSelector:selector])
     [observer_ webState:web_state() didChangeLoadingProgress:progress];
 }
 
 void WebStateObserverBridge::DocumentSubmitted(const std::string& form_name,
                                                bool user_initiated) {
   SEL selector =
       @selector(webState:didSubmitDocumentWithFormNamed:userInitiated:);
@@ skipping 41 matching lines @@
 void WebStateObserverBridge::WebStateDestroyed() {
   SEL selector = @selector(webStateDestroyed:);
   if ([observer_ respondsToSelector:selector]) {
     // |webStateDestroyed:| may delete |this|, so don't expect |this| to be
     // valid afterwards.
     [observer_ webStateDestroyed:web_state()];
   }
 }
 
 }  // namespace web