Plumb redirect info out of net, through content, and into child processes.

content/browser/download/download_resource_handler.cc

Index: content/browser/download/download_resource_handler.cc
diff --git a/content/browser/download/download_resource_handler.cc b/content/browser/download/download_resource_handler.cc
index 073e25ce16a5597c36c4c182ce30512b5872575b..f2fb2a5b267f68158625704cbb4a9f09ee9952d4 100644
--- a/content/browser/download/download_resource_handler.cc
+++ b/content/browser/download/download_resource_handler.cc
@@ -141,12 +141,9 @@ bool DownloadResourceHandler::OnUploadProgress(uint64 position,
 }
 
 bool DownloadResourceHandler::OnRequestRedirected(
-    const GURL& url,
+    const net::RedirectInfo& redirect_info,
     ResourceResponse* response,
     bool* defer) {
-  // We treat a download as a main frame load, and thus update the policy URL
-  // on redirects.
-  request()->set_first_party_for_cookies(url);
   return true;
 }