Move the offline URL trimming to GetFormattedURL.

ios/chrome/browser/tabs/tab.mm

Index: ios/chrome/browser/tabs/tab.mm
diff --git a/ios/chrome/browser/tabs/tab.mm b/ios/chrome/browser/tabs/tab.mm
index a0a17d92dd9d19fadf2b3c799dcad2ff89442d64..9e99b4771706979cc423ffcdeaf6d27f6bd91e43 100644
--- a/ios/chrome/browser/tabs/tab.mm
+++ b/ios/chrome/browser/tabs/tab.mm
@@ -76,6 +76,7 @@
 #import "ios/chrome/browser/passwords/password_controller.h"
 #import "ios/chrome/browser/passwords/passwords_ui_delegate_impl.h"
 #include "ios/chrome/browser/pref_names.h"
+#include "ios/chrome/browser/reading_list/offline_url_utils.h"
 #include "ios/chrome/browser/reading_list/reading_list_model_factory.h"
 #include "ios/chrome/browser/reading_list/reading_list_web_state_observer.h"
 #include "ios/chrome/browser/search_engines/template_url_service_factory.h"
@@ -2421,6 +2422,11 @@ void AddNetworkClientFactoryOnIOThread(
           fromIndex > toIndex);
 }
 
+- (BOOL)isOffline {
+  return reading_list::IsOfflineURL(
+      [self navigationManager]->GetVisibleItem()->GetURL());
+}
+
 @end
 
 #pragma mark - TestingSupport