Revert of Set RequestContextObject for PNaCl pexe fetches, to fix On-Demand update.

components/nacl/renderer/ppb_nacl_private_impl.cc

 // 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.
 
 #include "components/nacl/renderer/ppb_nacl_private_impl.h"
 
 #include <numeric>
 #include <string>
 #include <vector>
 
@@ skipping 1648 matching lines @@
                                                   opt_level,
                                                   handler,
                                                   handler_user_data);
 
   blink::WebURLRequest url_request = CreateWebURLRequest(document, gurl);
   // Mark the request as requesting a PNaCl bitcode file,
   // so that component updater can detect this user action.
   url_request.addHTTPHeaderField(
       blink::WebString::fromUTF8("Accept"),
       blink::WebString::fromUTF8("application/x-pnacl, */*"));
-  url_request.setRequestContext(blink::WebURLRequest::RequestContextObject);
   downloader->Load(url_request);
 }
 
 const PPB_NaCl_Private nacl_interface = {
   &LaunchSelLdr,
   &StartPpapiProxy,
   &UrandomFD,
   &Are3DInterfacesDisabled,
   &BrokerDuplicateHandle,
   &GetReadExecPnaclFd,
@@ skipping 31 matching lines @@
   &StreamPexe
 };
 
 }  // namespace
 
 const PPB_NaCl_Private* GetNaClPrivateInterface() {
   return &nacl_interface;
 }
 
 }  // namespace nacl