Add CookieStore::DeleteSessionCookiesAsync method.

net/cookies/cookie_monster.h

Index: net/cookies/cookie_monster.h
diff --git a/net/cookies/cookie_monster.h b/net/cookies/cookie_monster.h
index f6485665983e9acfd36927926d3c049c39dff346..1eced597bf6e852660dd8a55e8b5bfa4d9314f31 100644
--- a/net/cookies/cookie_monster.h
+++ b/net/cookies/cookie_monster.h
@@ -246,6 +246,8 @@ class NET_EXPORT CookieMonster : public CookieStore {
       const base::Time& delete_end,
       const DeleteCallback& callback) OVERRIDE;
 
+  virtual void DeleteSessionCookiesAsync(const DeleteCallback&) OVERRIDE;
+
   virtual CookieMonster* GetCookieMonster() OVERRIDE;
 
   // Enables writing session cookies into the cookie database. If this this
@@ -281,6 +283,7 @@ class NET_EXPORT CookieMonster : public CookieStore {
   class GetCookiesWithInfoTask;
   class SetCookieWithDetailsTask;
   class SetCookieWithOptionsTask;
+  class DeleteSessionCookiesTask;
 
   // Testing support.
   // For SetCookieWithCreationTime.
@@ -412,6 +415,8 @@ class NET_EXPORT CookieMonster : public CookieStore {
                                  const std::string& cookie_line,
                                  const base::Time& creation_time);
 
+  int DeleteSessionCookies();
+
   // Called by all non-static functions to ensure that the cookies store has
   // been initialized. This is not done during creating so it doesn't block
   // the window showing.