ui: Cleanup class/struct forward declarations

components/offline_pages/offline_page_feature.h

Index: components/offline_pages/offline_page_feature.h
diff --git a/components/offline_pages/offline_page_feature.h b/components/offline_pages/offline_page_feature.h
index 98c1b27e911d469a2b43ba6c6b1824309e16c607..7e9618f78b39dfd7070fd21525e69bed01e1a5fa 100644
--- a/components/offline_pages/offline_page_feature.h
+++ b/components/offline_pages/offline_page_feature.h
@@ -16,6 +16,7 @@ extern const base::Feature kOfflinePagesBackgroundLoadingFeature;
 extern const base::Feature kOfflinePagesCTFeature;
 extern const base::Feature kOfflinePagesSharingFeature;
 extern const base::Feature kBackgroundLoaderForDownloadsFeature;
+extern const base::Feature kOfflinePagesAsyncDownloadFeature;
 
 // Returns true if saving bookmarked pages for offline viewing is enabled.
 bool IsOfflineBookmarksEnabled();
@@ -34,7 +35,9 @@ bool IsOfflinePagesSharingEnabled();
 
 bool IsBackgroundLoaderForDownloadsEnabled();
 
+// Returns true if downloading a page asynchonously is enabled.
+bool IsOfflinePagesAsyncDownloadEnabled();
+
 }  // namespace offline_pages
 
-#endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_FEATURE_H_>>>> Flag for Offline
-        // Page Sharing
+#endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_FEATURE_H_