Fix various issues in RedirectToFileResourceHandler.

content/browser/loader/async_resource_handler.cc

Index: content/browser/loader/async_resource_handler.cc
diff --git a/content/browser/loader/async_resource_handler.cc b/content/browser/loader/async_resource_handler.cc
index 52c1d8fd251d089c57fd2f37405afd89f688ea32..94628c7dc6db7fc9062f48a6c30616d76dad3038 100644
--- a/content/browser/loader/async_resource_handler.cc
+++ b/content/browser/loader/async_resource_handler.cc
@@ -197,6 +197,15 @@ bool AsyncResourceHandler::OnResponseStarted(int request_id,
             net::GetHostOrSpecFromURL(request_url))));
   }
 
+  // If the parent handler downloaded the resource to a file, grant the child
+  // read permissions on it. Note: there is similar logic in
+  // SyncResourceHandler.
+  if (!response->head.download_file_path.empty()) {
+    rdh_->RegisterDownloadedTempFile(
+        info->GetChildID(), info->GetRequestID(),
+        response->head.download_file_path);
+  }
+
   response->head.request_start = request()->creation_time();
   response->head.response_start = TimeTicks::Now();
   info->filter()->Send(new ResourceMsg_ReceivedResponse(request_id,