move file access permission logic to DownloadResourceThrottle

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

 // 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.
 
 #include "chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.h"
 
 #include <string>
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 457 matching lines @@
     bool is_content_initiated,
     bool must_download,
     ScopedVector<content::ResourceThrottle>* throttles) {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&NotifyDownloadInitiatedOnUI, child_id, route_id));
 
   // If it's from the web, we don't trust it, so we push the throttle on.
   if (is_content_initiated) {
     throttles->push_back(
-        new DownloadResourceThrottle(download_request_limiter_.get(),
+        new DownloadResourceThrottle(download_request_limiter_,
                                      child_id,
                                      route_id,
                                      request->url(),
                                      request->method()));
 #if defined(OS_ANDROID)
     throttles->push_back(
         new chrome::InterceptDownloadResourceThrottle(
             request, child_id, route_id, request_id));
 #endif
   }
@@ skipping 276 matching lines @@
                                        url_request->GetTotalReceivedBytes()));
   }
 }
 
 // static
 void ChromeResourceDispatcherHostDelegate::
     SetExternalProtocolHandlerDelegateForTesting(
     ExternalProtocolHandler::Delegate* delegate) {
   g_external_protocol_handler_delegate = delegate;
 }