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

chrome/browser/pdf/pdf_extension_test.cc

Index: chrome/browser/pdf/pdf_extension_test.cc
diff --git a/chrome/browser/pdf/pdf_extension_test.cc b/chrome/browser/pdf/pdf_extension_test.cc
index 74f8a17e9ee227943c303474307bc91e4148e893..fd907fbbb2e6e9004cf9d88d96165810073a3c76 100644
--- a/chrome/browser/pdf/pdf_extension_test.cc
+++ b/chrome/browser/pdf/pdf_extension_test.cc
@@ -909,3 +909,10 @@ IN_PROC_BROWSER_TEST_F(PDFExtensionTest, LinkShiftLeftClick) {
   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
+// to load. This is to avoid the source origin of the document changing during
+// the redirect, which can have security implications. crbug.com/653749
+IN_PROC_BROWSER_TEST_F(PDFExtensionTest, RedirectsFailInPlugin) {
+  RunTestsInFile("redirects_fail_test.js", "test.pdf");
+}