Using separate directories based on LifetimeType.

components/offline_pages/offline_page_test_archiver.cc

Index: components/offline_pages/offline_page_test_archiver.cc
diff --git a/components/offline_pages/offline_page_test_archiver.cc b/components/offline_pages/offline_page_test_archiver.cc
index a4b73ee0f6b8121f508afab6983339faaa47e0c6..c4ee8bf6f8eed52eff750f350013951c9c3cdc73 100644
--- a/components/offline_pages/offline_page_test_archiver.cc
+++ b/components/offline_pages/offline_page_test_archiver.cc
@@ -45,6 +45,7 @@ void OfflinePageTestArchiver::CompleteCreateArchive() {
   DCHECK(!callback_.is_null());
   base::FilePath archive_path;
   if (filename_.empty()) {
+    ASSERT_TRUE(base::CreateDirectory(archives_dir_));
     ASSERT_TRUE(base::CreateTemporaryFileInDir(archives_dir_, &archive_path));
   } else {
     archive_path = archives_dir_.Append(filename_);