Use DidFinishNavigation callback in LanguageDetectionController.

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

 // 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.
 
 #ifndef IOS_WEB_PUBLIC_TEST_FAKES_CRW_TEST_WEB_STATE_OBSERVER_H_
 #define IOS_WEB_PUBLIC_TEST_FAKES_CRW_TEST_WEB_STATE_OBSERVER_H_
 
 #include "ios/web/public/favicon_url.h"
 #include "ios/web/public/load_committed_details.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
@@ skipping 17 matching lines @@
 struct TestLoadPageInfo {
   WebState* web_state;
   BOOL success;
 };
 
 // Arguments passed to |webStateDidDismissInterstitial:|.
 struct TestDismissInterstitialInfo {
   WebState* web_state;
 };
 
-// Arguments passed to |webStateDidChangeURLHash:|.
-struct TestChangeUrlHashInfo {
-  WebState* web_state;
-};
-
 // Arguments passed to |webStateDidChangeHistoryState:|.
 struct TestChangeHistoryStateInfo {
   WebState* web_state;
 };
 
 // Arguments passed to |webState:didChangeLoadingProgress:|.
 struct TestChangeLoadingProgressInfo {
   WebState* web_state;
   double progress;
 };
@@ skipping 55 matching lines @@
 @property(nonatomic, readonly)
     web::TestStartProvisionalNavigationInfo* startProvisionalNavigationInfo;
 // Arguments passed to |webState:didCommitNavigationWithDetails:|.
 @property(nonatomic, readonly)
     web::TestCommitNavigationInfo* commitNavigationInfo;
 // Arguments passed to |webState:didLoadPageWithSuccess:|.
 @property(nonatomic, readonly) web::TestLoadPageInfo* loadPageInfo;
 // Arguments passed to |webStateDidDismissInterstitial:|.
 @property(nonatomic, readonly)
     web::TestDismissInterstitialInfo* dismissInterstitialInfo;
-// Arguments passed to |webStateDidChangeURLHash:|.
-@property(nonatomic, readonly) web::TestChangeUrlHashInfo* changeUrlHashInfo;
 // Arguments passed to |webStateDidChangeHistoryState:|.
 @property(nonatomic, readonly)
     web::TestChangeHistoryStateInfo* changeHistoryStateInfo;
 // Arguments passed to |webState:didChangeLoadingProgress:|.
 @property(nonatomic, readonly)
     web::TestChangeLoadingProgressInfo* changeLoadingProgressInfo;
 // Arguments passed to |webState:didSubmitDocumentWithFormNamed:userInitiated:|.
 @property(nonatomic, readonly) web::TestSubmitDocumentInfo* submitDocumentInfo;
 // Arguments passed to
 // |webState:didRegisterFormActivityWithFormNamed:fieldName:type:value:|.
 @property(nonatomic, readonly) web::TestFormActivityInfo* formActivityInfo;
 // Arguments passed to |webState:didUpdateFaviconURLCandidates|.
 @property(nonatomic, readonly)
     web::TestUpdateFaviconUrlCandidatesInfo* updateFaviconUrlCandidatesInfo;
 // Arguments passed to |webState:renderProcessGoneForWebState:|.
 @property(nonatomic, readonly)
     web::TestRenderProcessGoneInfo* renderProcessGoneInfo;
 // Arguments passed to |webStateDestroyed:|.
 @property(nonatomic, readonly)
     web::TestWebStateDestroyedInfo* webStateDestroyedInfo;
 // Arguments passed to |webStateDidStopLoading:|.
 @property(nonatomic, readonly) web::TestStopLoadingInfo* stopLoadingInfo;
 // Arguments passed to |webStateDidStartLoading:|.
 @property(nonatomic, readonly) web::TestStartLoadingInfo* startLoadingInfo;
 
 @end
 
 #endif  // IOS_WEB_PUBLIC_TEST_FAKES_CRW_TEST_WEB_STATE_OBSERVER_H_