Fixed title updating for back forward navigation.

ios/web/web_state/ui/crw_wk_navigation_states_unittest.mm

Index: ios/web/web_state/ui/crw_wk_navigation_states_unittest.mm
diff --git a/ios/web/web_state/ui/crw_wk_navigation_states_unittest.mm b/ios/web/web_state/ui/crw_wk_navigation_states_unittest.mm
index 61c44093c0ca5c99fed4017853655b0e83707f0a..5b3eb4f313dd1cec5a721b0da7c627aac0935673 100644
--- a/ios/web/web_state/ui/crw_wk_navigation_states_unittest.mm
+++ b/ios/web/web_state/ui/crw_wk_navigation_states_unittest.mm
@@ -31,14 +31,22 @@ TEST_F(CRWWKNavigationStatesTest, LastAddedNavigation) {
   // navigation_1 is the only navigation and it is the latest.
   [states_ setState:WKNavigationState::REQUESTED forNavigation:navigation1_];
   EXPECT_EQ(navigation1_, [states_ lastAddedNavigation]);
+  EXPECT_EQ(WKNavigationState::REQUESTED, [states_ lastAddedNavigationState]);
 
   // navigation_2 is added later and hence the latest.
   [states_ setState:WKNavigationState::REQUESTED forNavigation:navigation2_];
   EXPECT_EQ(navigation2_, [states_ lastAddedNavigation]);
+  EXPECT_EQ(WKNavigationState::REQUESTED, [states_ lastAddedNavigationState]);
 
   // Updating state for existing navigation does not make it the latest.
   [states_ setState:WKNavigationState::STARTED forNavigation:navigation1_];
   EXPECT_EQ(navigation2_, [states_ lastAddedNavigation]);
+  EXPECT_EQ(WKNavigationState::REQUESTED, [states_ lastAddedNavigationState]);
+
+  // navigation_2 is still the latest.
+  [states_ setState:WKNavigationState::STARTED forNavigation:navigation2_];
+  EXPECT_EQ(navigation2_, [states_ lastAddedNavigation]);
+  EXPECT_EQ(WKNavigationState::STARTED, [states_ lastAddedNavigationState]);
 }
 
 }  // namespace web