add a couple of casts.

components/offline_pages/offline_page_storage_manager.cc

Index: components/offline_pages/offline_page_storage_manager.cc
diff --git a/components/offline_pages/offline_page_storage_manager.cc b/components/offline_pages/offline_page_storage_manager.cc
index 266615b00b6536a1780d997541abcc61ec65c6b9..dcebc5c4ab96fc435d4e7bedb2284c11b4110bcb 100644
--- a/components/offline_pages/offline_page_storage_manager.cc
+++ b/components/offline_pages/offline_page_storage_manager.cc
@@ -66,9 +66,9 @@ void OfflinePageStorageManager::OnGetAllPagesDone(
   std::vector<int64_t> offline_ids;
   GetExpiredPageIds(pages, stats, offline_ids);
   client_->DeletePagesByOfflineId(
-      offline_ids,
-      base::Bind(&OfflinePageStorageManager::OnExpiredPagesDeleted,
-                 weak_ptr_factory_.GetWeakPtr(), callback, offline_ids.size()));
+      offline_ids, base::Bind(&OfflinePageStorageManager::OnExpiredPagesDeleted,
+                              weak_ptr_factory_.GetWeakPtr(), callback,
+                              static_cast<int>(offline_ids.size())));
 }
 
 void OfflinePageStorageManager::OnExpiredPagesDeleted(