PlzNavigate: identify same-page browser-initiated navigation.

ios/web/navigation/navigation_manager_impl.mm

Index: ios/web/navigation/navigation_manager_impl.mm
diff --git a/ios/web/navigation/navigation_manager_impl.mm b/ios/web/navigation/navigation_manager_impl.mm
index 6d7835c92d4c47ab694a11b77e8198b34d45afa2..9c409dc79c8ddaacadb3ed38d0f83706fbb6aa24 100644
--- a/ios/web/navigation/navigation_manager_impl.mm
+++ b/ios/web/navigation/navigation_manager_impl.mm
@@ -18,28 +18,13 @@
 #include "ios/web/public/load_committed_details.h"
 #import "ios/web/public/navigation_item.h"
 #import "ios/web/public/web_state/web_state.h"
+#include "net/base/url_util.h"
 #include "ui/base/page_transition_types.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
-namespace {
-
-// Checks whether or not two URL are an in-page navigation (differing only
-// in the fragment).
-bool AreURLsInPageNavigation(const GURL& existing_url, const GURL& new_url) {
-  if (existing_url == new_url || !new_url.has_ref())
-    return false;
-
-  url::Replacements<char> replacements;
-  replacements.ClearRef();
-  return existing_url.ReplaceComponents(replacements) ==
-         new_url.ReplaceComponents(replacements);
-}
-
-}  // anonymous namespace
-
 namespace web {
 
 NavigationManager::WebLoadParams::WebLoadParams(const GURL& url)
@@ -146,8 +131,8 @@ void NavigationManagerImpl::OnNavigationItemCommitted() {
     DCHECK([session_controller_ previousEntry]);
     details.previous_url =
         [session_controller_ previousEntry].navigationItem->GetURL();
-    details.is_in_page =
-        AreURLsInPageNavigation(details.previous_url, details.item->GetURL());
+    details.is_in_page = net::IsFragmentAddedOrUpdated(details.previous_url,
+                                                       details.item->GetURL());
   } else {
     details.previous_url = GURL();
     details.is_in_page = NO;