Mark NPAPITesterBase.GetURLRedirectNotification test as flaky on linux.

chrome/test/ui/npapi_uitest.cc

Index: chrome/test/ui/npapi_uitest.cc
diff --git a/chrome/test/ui/npapi_uitest.cc b/chrome/test/ui/npapi_uitest.cc
index be0a7c991d04a68eb69d205adb180bc6715ac18d..4c77e5c994158d29a709d3689f802ef369c498b3 100644
--- a/chrome/test/ui/npapi_uitest.cc
+++ b/chrome/test/ui/npapi_uitest.cc
@@ -92,7 +92,13 @@ TEST_F(NPAPITesterBase, GetJavaScriptURL2) {
                 kTestCompleteSuccess, TestTimeouts::action_max_timeout_ms());
 }
 
-TEST_F(NPAPITesterBase, GetURLRedirectNotification) {
+// Test is flaky on linux/cros builders.  http://crbug.com/71904
+#if defined(OS_POSIX)
+#define MAYBE_GetURLRedirectNotification FLAKY_GetURLRedirectNotification
+#else
+#define MAYBE_GetURLRedirectNotification GetURLRedirectNotification
+#endif
+TEST(NPAPITesterBase, MAYBE_GetURLRedirectNotification) {
   const FilePath test_case(FILE_PATH_LITERAL("geturl_redirect_notify.html"));
   GURL url = ui_test_utils::GetTestUrl(FilePath(kTestDir), test_case);
   ASSERT_NO_FATAL_FAILURE(NavigateToURL(url));