Revert blocking of file: downloads.

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 df82179a18bc0dbc537ab1b9d421455c3ebdaca0..fef110fe7649ac8a3d06247c021146fa90e215bf 100644
--- a/content/browser/download/download_resource_handler.cc
+++ b/content/browser/download/download_resource_handler.cc
@@ -98,8 +98,7 @@ bool DownloadResourceHandler::OnResponseStarted(
            << " request_id = " << request_id;
   download_start_time_ = base::TimeTicks::Now();
 
-  if (request_->url().scheme() == "file" ||
-      request_->url().scheme() == "data") {
+  if (request_->url().scheme() == "data") {
     CallStartedCB(download_id_, net::ERR_DISALLOWED_URL_SCHEME);
     return false;
   }