[NaCl SDK] nacl_io: Fix gaping memory leaks in memfs and htmlfs

native_client_sdk/src/libraries/nacl_io/httpfs/http_fs_node.h

 // Copyright 2013 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 LIBRARIES_NACL_IO_HTTPFS_HTTP_FS_NODE_H_
 #define LIBRARIES_NACL_IO_HTTPFS_HTTP_FS_NODE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 24 matching lines @@
                       size_t count,
                       int* out_bytes);
 
   void SetCachedSize(off_t size);
 
  protected:
   HttpFsNode(Filesystem* filesystem,
              const std::string& url,
              bool cache_content);
 
+  virtual ~HttpFsNode();
+
  private:
   Error GetStat_Locked(struct stat* stat);
   Error OpenUrl(const char* method,
                 StringMap_t* request_headers,
                 ScopedResource* out_loader,
                 ScopedResource* out_request,
                 ScopedResource* out_response,
                 int32_t* out_statuscode,
                 StringMap_t* out_response_headers);
 
@@ skipping 35 matching lines @@
   bool cache_content_;
   bool has_cached_size_;
   std::vector<char> cached_data_;
 
   friend class HttpFs;
 };
 
 }  // namespace nacl_io
 
 #endif  // LIBRARIES_NACL_IO_HTTPFS_HTTP_FS_NODE_H_