[Sync] Fix namespaces for the sync_sessions component.

ios/chrome/browser/ui/webui/history/favicon_source.cc

Index: ios/chrome/browser/ui/webui/history/favicon_source.cc
diff --git a/ios/chrome/browser/ui/webui/history/favicon_source.cc b/ios/chrome/browser/ui/webui/history/favicon_source.cc
index b1571d091c2ad5774e8d7b30f2858171624b694b..4f3d553f8beba65a9b791bc14fad79af7e7b9a34 100644
--- a/ios/chrome/browser/ui/webui/history/favicon_source.cc
+++ b/ios/chrome/browser/ui/webui/history/favicon_source.cc
@@ -121,7 +121,7 @@ bool FaviconSource::ShouldReplaceExistingSource() const {
 
 bool FaviconSource::HandleMissingResource(const IconRequest& request) {
   // If the favicon is not available, try to use the synced favicon.
-  sync_driver::OpenTabsUIDelegate* open_tabs =
+  sync_sessions::OpenTabsUIDelegate* open_tabs =
       sync_service_ ? sync_service_->GetOpenTabsUIDelegate() : nullptr;
 
   scoped_refptr<base::RefCountedMemory> response;