Attempt 2 at landing this....

net/base/cookie_store.h

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Brought to you by number 42.
 
 #ifndef NET_BASE_COOKIE_STORE_H_
 #define NET_BASE_COOKIE_STORE_H_
 
 #include <string>
@@ skipping 41 matching lines @@
   // Simple interface, get a cookie string "a=b; c=d" for the given URL.
   // It will _not_ return httponly cookies, see CookieOptions.
   virtual std::string GetCookies(const GURL& url) = 0;
   virtual std::string GetCookiesWithOptions(const GURL& url,
                                             const CookieOptions& options) = 0;
 
   virtual CookieMonster* GetCookieMonster() {
     return NULL;
   };
 
+  // Deletes the passed in cookie for the specified URL.
+  virtual void DeleteCookie(const GURL& url,
+                            const std::string& cookie_name) = 0;
+
  protected:
   friend class base::RefCountedThreadSafe<CookieStore>;
   virtual ~CookieStore() {}
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_COOKIE_STORE_H_