Use the current title for items created by same document navigations.

ios/web/web_state/ui/crw_web_controller_unittest.mm

Index: ios/web/web_state/ui/crw_web_controller_unittest.mm
diff --git a/ios/web/web_state/ui/crw_web_controller_unittest.mm b/ios/web/web_state/ui/crw_web_controller_unittest.mm
index bc71bfbc9ba346bbff34daa0ab4b37d414ff0ad9..2f9a6c94872164b3bc2d181c35beab9f8ddb6188 100644
--- a/ios/web/web_state/ui/crw_web_controller_unittest.mm
+++ b/ios/web/web_state/ui/crw_web_controller_unittest.mm
@@ -851,6 +851,14 @@ TEST_F(CRWWebControllerTitleTest, TitleChange) {
   EXPECT_GE(observer.title_change_count(), 2);
 };
 
+// Tests that fragment change navigations use title from the previous page.
+TEST_F(CRWWebControllerTitleTest, FragmentChangeNavigationsUsePreviousTitle) {
+  LoadHtml(@"<title>Title1</title>");
+  ASSERT_EQ("Title1", base::UTF16ToUTF8(web_state()->GetTitle()));
+  ExecuteJavaScript(@"window.location.hash = '#1'");
+  EXPECT_EQ("Title1", base::UTF16ToUTF8(web_state()->GetTitle()));
+}
+
 // Test fixture for JavaScript execution.
 class ScriptExecutionTest : public web::WebTestWithWebController {
  protected: