Fix chromium-style compile error that got in the tree since yesterday.

chrome/test/webdriver/cookie.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/test/webdriver/cookie.h"
 
 #include <time.h>
 
 #include "base/string_util.h"
 #include "base/values.h"
@@ skipping 71 matching lines @@
       valid_ = false;
       return;
     }
 #endif
     expires_ = std::string(buff);
   }
 
   valid_ = true;
 }
 
+Cookie::~Cookie() {}
+
 // Convert's to webdriver's cookie spec, see:
 // http://code.google.com/p/selenium/wiki/JsonWireProtocol#/session/:sessionId/cookie
 DictionaryValue* Cookie::ToDictionary() {
   DictionaryValue* cookie = new DictionaryValue();
 
   // Required parameters for WebDriver protocol.
   cookie->SetString("name", name_);
   cookie->SetString("value", value_);
   cookie->SetString("path", path_);
   cookie->SetString("domain", domain_);
@@ skipping 37 matching lines @@
   }
   if (http_) {
     cookie += "http_only;";
   }
 
   return cookie;
 }
 
 }  // namespace webdriver