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

components/nacl/renderer/manifest_downloader.h

Index: components/nacl/renderer/manifest_downloader.h
diff --git a/components/nacl/renderer/manifest_downloader.h b/components/nacl/renderer/manifest_downloader.h
index 1dd6cb6ee44a2405a252ad397e6b23f03960cf27..31e07a0333f028124c77b7974c645bc2d5f65c16 100644
--- a/components/nacl/renderer/manifest_downloader.h
+++ b/components/nacl/renderer/manifest_downloader.h
@@ -37,6 +37,8 @@ class ManifestDownloader : public blink::WebURLLoaderClient {
   void Load(const blink::WebURLRequest& request);
 
  private:
+  void done();
+
   // WebURLLoaderClient implementation.
   virtual void didReceiveResponse(blink::WebURLLoader* loader,
                                   const blink::WebURLResponse& response);