Test downloads.download() disallows unsafe headers

chrome/browser/download/download_hidden.cc

Index: chrome/browser/download/download_hidden.cc
diff --git a/chrome/browser/download/download_hidden.cc b/chrome/browser/download/download_hidden.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e48c326bbacdddb831d5b53f5febbe19f5de42f2
--- /dev/null
+++ b/chrome/browser/download/download_hidden.cc
@@ -0,0 +1,20 @@
+// 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/download/download_hidden.h"
+
+namespace {
+static const char kKey[] = "DownloadItem DownloadHidden";
+}
+
+bool DownloadHidden::Get(content::DownloadItem* download_item) {
+  return download_item->GetExternalData(kKey) != NULL;
+}
+
+DownloadHidden::DownloadHidden(content::DownloadItem* download_item) {
+  download_item->SetExternalData(kKey, this);
+}
+
+DownloadHidden::~DownloadHidden() {
+}