Use DidFinishNavigation callback in LanguageDetectionController.

ios/web/public/test/fakes/crw_test_web_state_observer.mm

 // Copyright 2017 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/test/fakes/crw_test_web_state_observer.h"
 
 #include "base/memory/ptr_util.h"
 
 namespace web {
 TestFormActivityInfo::TestFormActivityInfo() {}
 TestFormActivityInfo::~TestFormActivityInfo() = default;
 TestUpdateFaviconUrlCandidatesInfo::TestUpdateFaviconUrlCandidatesInfo() {}
 TestUpdateFaviconUrlCandidatesInfo::~TestUpdateFaviconUrlCandidatesInfo() =
     default;
 }
 
 @implementation CRWTestWebStateObserver {
   // Arguments passed to |webState:didStartProvisionalNavigationForURL:|.
   std::unique_ptr<web::TestStartProvisionalNavigationInfo>
       _startProvisionalNavigationInfo;
   // Arguments passed to |webState:didCommitNavigationWithDetails:|.
   std::unique_ptr<web::TestCommitNavigationInfo> _commitNavigationInfo;
   // Arguments passed to |webState:didLoadPageWithSuccess:|.
   std::unique_ptr<web::TestLoadPageInfo> _loadPageInfo;
   // Arguments passed to |webStateDidDismissInterstitial:|.
   std::unique_ptr<web::TestDismissInterstitialInfo> _dismissInterstitialInfo;
-  // Arguments passed to |webStateDidChangeURLHash:|.
-  std::unique_ptr<web::TestChangeUrlHashInfo> _changeUrlHashInfo;
   // Arguments passed to |webStateDidChangeHistoryState:|.
   std::unique_ptr<web::TestChangeHistoryStateInfo> _changeHistoryStateInfo;
   // Arguments passed to |webState:didChangeLoadingProgress:|.
   std::unique_ptr<web::TestChangeLoadingProgressInfo>
       _changeLoadingProgressInfo;
   // Arguments passed to
   // |webState:didSubmitDocumentWithFormNamed:userInitiated:|.
   std::unique_ptr<web::TestSubmitDocumentInfo> _submitDocumentInfo;
   // Arguments passed to
   // |webState:didRegisterFormActivityWithFormNamed:fieldName:type:value:|.
@@ skipping 20 matching lines @@
 }
 
 - (web::TestLoadPageInfo*)loadPageInfo {
   return _loadPageInfo.get();
 }
 
 - (web::TestDismissInterstitialInfo*)dismissInterstitialInfo {
   return _dismissInterstitialInfo.get();
 }
 
-- (web::TestChangeUrlHashInfo*)changeUrlHashInfo {
-  return _changeUrlHashInfo.get();
-}
-
 - (web::TestChangeHistoryStateInfo*)changeHistoryStateInfo {
   return _changeHistoryStateInfo.get();
 }
 
 - (web::TestChangeLoadingProgressInfo*)changeLoadingProgressInfo {
   return _changeLoadingProgressInfo.get();
 }
 
 - (web::TestSubmitDocumentInfo*)submitDocumentInfo {
   return _submitDocumentInfo.get();
@@ skipping 46 matching lines @@
   _loadPageInfo->web_state = webState;
   _loadPageInfo->success = success;
 }
 
 - (void)webStateDidDismissInterstitial:(web::WebState*)webState {
   _dismissInterstitialInfo =
       base::MakeUnique<web::TestDismissInterstitialInfo>();
   _dismissInterstitialInfo->web_state = webState;
 }
 
-- (void)webStateDidChangeURLHash:(web::WebState*)webState {
-  _changeUrlHashInfo = base::MakeUnique<web::TestChangeUrlHashInfo>();
-  _changeUrlHashInfo->web_state = webState;
-}
-
 - (void)webStateDidChangeHistoryState:(web::WebState*)webState {
   _changeHistoryStateInfo = base::MakeUnique<web::TestChangeHistoryStateInfo>();
   _changeHistoryStateInfo->web_state = webState;
 }
 
 - (void)webState:(web::WebState*)webState
     didChangeLoadingProgress:(double)progress {
   _changeLoadingProgressInfo =
       base::MakeUnique<web::TestChangeLoadingProgressInfo>();
   _changeLoadingProgressInfo->web_state = webState;
@@ skipping 47 matching lines @@
   _stopLoadingInfo = base::MakeUnique<web::TestStopLoadingInfo>();
   _stopLoadingInfo->web_state = webState;
 }
 
 - (void)webStateDidStartLoading:(web::WebState*)webState {
   _startLoadingInfo = base::MakeUnique<web::TestStartLoadingInfo>();
   _startLoadingInfo->web_state = webState;
 }
 
 @end