GTTF: Add missing virtual destructors.

net/http/http_pipelined_host_pool.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_HTTP_HTTP_PIPELINED_HOST_POOL_H_
 #define NET_HTTP_HTTP_PIPELINED_HOST_POOL_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 17 matching lines @@
 // assigns requests to the least loaded pipelined connection.
 class NET_EXPORT_PRIVATE HttpPipelinedHostPool
     : public HttpPipelinedHost::Delegate {
  public:
   class Delegate {
    public:
     // Called when a HttpPipelinedHost has new capacity. Attempts to allocate
     // any pending pipeline-capable requests to pipelines.
     virtual void OnHttpPipelinedHostHasAdditionalCapacity(
         HttpPipelinedHost* host) = 0;
+
+   protected:
+    virtual ~Delegate() {}
   };
 
   HttpPipelinedHostPool(Delegate* delegate,
                         HttpPipelinedHost::Factory* factory,
                         HttpServerProperties* http_server_properties_,
                         bool force_pipelining);
   virtual ~HttpPipelinedHostPool();
 
   // Returns true if pipelining might work for |key|. Generally, this returns
   // true, unless |key| is known to have failed pipelining recently.
@@ skipping 43 matching lines @@
   HostMap host_map_;
   HttpServerProperties* http_server_properties_;
   bool force_pipelining_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpPipelinedHostPool);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_PIPELINED_HOST_POOL_H_