Add test to ensure that URLs that redirect inside the PDF plugin fail to load

chrome/browser/pdf/pdf_extension_test.cc

 // Copyright 2014 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 <stddef.h>
 
 #include <vector>
 
 #include "base/base_paths.h"
 #include "base/files/file_enumerator.h"
@@ skipping 892 matching lines @@
 
   ASSERT_EQ(2U, chrome::GetTotalBrowserCount());
 
   content::WebContents* active_web_contents =
       chrome::FindLastActive()->tab_strip_model()->GetActiveWebContents();
   ASSERT_NE(web_contents, active_web_contents);
 
   const GURL& url = active_web_contents->GetURL();
   ASSERT_EQ(std::string("http://www.example.com/"), url.spec());
 }
+
+// Test that if the plugin tries to load a URL that redirects that it will fail

[Lei Zhang, 2016/11/08 01:28:10]

... _then_ it will fail?

[raymes, 2016/11/08 06:00:01]

Done.

+// to load. This is to avoid the source origin of the document changing during
+// the redirect, which can have security implications. crbug.com/653749

[Lei Zhang, 2016/11/08 01:28:10]

If you add https:// in the URL, then cs.chromium.org will auto-linkify, which is
nice.

[raymes, 2016/11/08 06:00:01]

Done.

+IN_PROC_BROWSER_TEST_F(PDFExtensionTest, RedirectsFailInPlugin) {
+  RunTestsInFile("redirects_fail_test.js", "test.pdf");
+}