Add CookieStore::DeleteSessionCookiesAsync method.

net/cookies/cookie_store.h

Index: net/cookies/cookie_store.h
diff --git a/net/cookies/cookie_store.h b/net/cookies/cookie_store.h
index b9772d5af7fc222059375b2b498717536437e888..2cf7e0eced9bd7bad6d7e9cc59048bf2adf589ef 100644
--- a/net/cookies/cookie_store.h
+++ b/net/cookies/cookie_store.h
@@ -99,6 +99,8 @@ class NET_EXPORT CookieStore : public base::RefCountedThreadSafe<CookieStore> {
                                             const base::Time& delete_end,
                                             const DeleteCallback& callback) = 0;
 
+  virtual void DeleteSessionCookiesAsync(const DeleteCallback&) = 0;
+
   // Returns the underlying CookieMonster.
   virtual CookieMonster* GetCookieMonster() = 0;