Use DidFinishNavigation callback in LanguageDetectionController.

ios/web/web_state/web_state_impl_unittest.mm

Index: ios/web/web_state/web_state_impl_unittest.mm
diff --git a/ios/web/web_state/web_state_impl_unittest.mm b/ios/web/web_state/web_state_impl_unittest.mm
index 992132f9f2dbc2eb5afb9ca6c315292d65e3df37..3aa7097011a1b22d10224c578d8cef5c0de1a014 100644
--- a/ios/web/web_state/web_state_impl_unittest.mm
+++ b/ios/web/web_state/web_state_impl_unittest.mm
@@ -127,7 +127,6 @@ class TestWebStateObserver : public WebStateObserver {
         navigation_item_changed_called_(false),
         navigation_item_committed_called_(false),
         page_loaded_called_with_success_(false),
-        url_hash_changed_called_(false),
         history_state_changed_called_(false),
         did_finish_navigation_called_(false),
         web_state_destroyed_called_(false) {}
@@ -149,7 +148,6 @@ class TestWebStateObserver : public WebStateObserver {
   bool page_loaded_called_with_success() const {
     return page_loaded_called_with_success_;
   }
-  bool url_hash_changed_called() const { return url_hash_changed_called_; }
   bool history_state_changed_called() const {
     return history_state_changed_called_;
   }
@@ -182,8 +180,6 @@ class TestWebStateObserver : public WebStateObserver {
     page_loaded_called_with_success_ =
         load_completion_status == PageLoadCompletionStatus::SUCCESS;
   }
-  void UrlHashChanged() override { url_hash_changed_called_ = true; }
-  void HistoryStateChanged() override { history_state_changed_called_ = true; }
   void WebStateDestroyed() override {
     EXPECT_TRUE(web_state()->IsBeingDestroyed());
     web_state_destroyed_called_ = true;
@@ -195,7 +191,6 @@ class TestWebStateObserver : public WebStateObserver {
   bool navigation_item_changed_called_;
   bool navigation_item_committed_called_;
   bool page_loaded_called_with_success_;
-  bool url_hash_changed_called_;
   bool history_state_changed_called_;
   bool did_finish_navigation_called_;
   bool web_state_destroyed_called_;
@@ -392,16 +387,6 @@ TEST_F(WebStateTest, ObserverTest) {
   web_state_->OnPageLoaded(GURL("http://test"), true);
   EXPECT_TRUE(observer->page_loaded_called_with_success());
 
-  // Test that UrlHashChanged() is called.
-  EXPECT_FALSE(observer->url_hash_changed_called());
-  web_state_->OnUrlHashChanged();
-  EXPECT_TRUE(observer->url_hash_changed_called());
-
-  // Test that HistoryStateChanged() is called.
-  EXPECT_FALSE(observer->history_state_changed_called());
-  web_state_->OnHistoryStateChanged();
-  EXPECT_TRUE(observer->history_state_changed_called());
-
   // Test that DidFinishNavigation() is called for same page navigations.
   EXPECT_FALSE(observer->did_finish_navigation_called());
   web_state_->OnSamePageNavigation(GURL("http://test"));