Reuse webview classic cookies file

content/public/browser/cookie_store_factory.h

Index: content/public/browser/cookie_store_factory.h
diff --git a/content/public/browser/cookie_store_factory.h b/content/public/browser/cookie_store_factory.h
index c7a9c6eb4172ee576529f5b756dd7efc638893df..22de97d5911752c6a68f43077d40cfd1d94df95e 100644
--- a/content/public/browser/cookie_store_factory.h
+++ b/content/public/browser/cookie_store_factory.h
@@ -18,11 +18,15 @@ class SpecialStoragePolicy;
 
 namespace content {
 
+// All blocking database accesses will be performed on |background_task_runner|.
+// If background_task_runner is NULL, then a background task runner will be
+// created internally.
 CONTENT_EXPORT net::CookieStore* CreatePersistentCookieStore(
     const base::FilePath& path,
     bool restore_old_session_cookies,
     quota::SpecialStoragePolicy* storage_policy,
-    net::CookieMonster::Delegate* cookie_monster_delegate);
+    net::CookieMonster::Delegate* cookie_monster_delegate,
+    const scoped_refptr<base::SequencedTaskRunner>& background_task_runner);
 
 }  // namespace content