Make SQLitePersistentCookieStore run on injected SequencedTaskRunners vs named BrowserThreads.

chrome/browser/net/sqlite_persistent_cookie_store.h

Index: chrome/browser/net/sqlite_persistent_cookie_store.h
diff --git a/chrome/browser/net/sqlite_persistent_cookie_store.h b/chrome/browser/net/sqlite_persistent_cookie_store.h
index bb6206d8f211ca9dc36a5b394a49ae806e5b2699..fae504d08de6c21b0dca4128615e4505db5e9882 100644
--- a/chrome/browser/net/sqlite_persistent_cookie_store.h
+++ b/chrome/browser/net/sqlite_persistent_cookie_store.h
@@ -20,6 +20,7 @@ class Task;
 
 namespace base {
 class FilePath;
+class SequencedTaskRunner;
 }
 
 namespace net {
@@ -36,8 +37,13 @@ class SQLitePersistentCookieStore
  public:
   // If non-NULL, SQLitePersistentCookieStore will keep a scoped_refptr to the
   // |clear_on_exit_policy| throughout its lifetime.
+  // All blocking database accesses will be performed on
+  // |background_task_runner|, while |client_task_runner| is used to invoke
+  // callbacks.
   SQLitePersistentCookieStore(
       const base::FilePath& path,
+      const scoped_refptr<base::SequencedTaskRunner>& client_task_runner,
+      const scoped_refptr<base::SequencedTaskRunner>& background_task_runner,
       bool restore_old_session_cookies,
       ClearOnExitPolicy* clear_on_exit_policy);