Make the WebURLLoaderClients in the pepper code destroy (or have some guard) the loader in didFail()

components/nacl/renderer/manifest_downloader.h

 // Copyright 2014 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 <string>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/nacl/renderer/ppb_nacl_private.h"
 #include "third_party/WebKit/public/platform/WebURLLoaderClient.h"
@@ skipping 19 matching lines @@
   static const size_t kNaClManifestMaxFileBytes = 1024 * 1024;
 
   ManifestDownloader(scoped_ptr<blink::WebURLLoader> url_loader,
                      bool is_installed,
                      Callback cb);
   virtual ~ManifestDownloader();
 
   void Load(const blink::WebURLRequest& request);
 
  private:
+  void Close();
+
   // WebURLLoaderClient implementation.
   virtual void didReceiveResponse(blink::WebURLLoader* loader,
                                   const blink::WebURLResponse& response);
   virtual void didReceiveData(blink::WebURLLoader* loader,
                               const char* data,
                               int data_length,
                               int encoded_data_length);
   virtual void didFinishLoading(blink::WebURLLoader* loader,
                                 double finish_time,
                                 int64_t total_encoded_data_length);
   virtual void didFail(blink::WebURLLoader* loader,
                        const blink::WebURLError& error);
 
   scoped_ptr<blink::WebURLLoader> url_loader_;
   bool is_installed_;
   Callback cb_;
   std::string buffer_;
   int status_code_;
   PP_NaClError pp_nacl_error_;
 };
 
 }  // namespace nacl