linux_aura: Turn it on again.

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index 75802e82a10b8455b4e64d9030ae96d67b95298f..35b3bffae939fb5b0042b4192079c84fe8dc039c 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -2454,9 +2454,17 @@ IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest,
   OpenDestURLViaClickTarget();
 }
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(USE_AURA)
+// TODO(erg): linux_aura bringup: http://crbug.com/163931
+#define MAYBE_PrerenderSSLClientCertTopLevel DISABLED_PrerenderSSLClientCertTopLevel
+#else
+#define MAYBE_PrerenderSSLClientCertTopLevel PrerenderSSLClientCertTopLevel
+#endif
+
 // Checks that a top-level page which would normally request an SSL client
 // certificate will never be seen since it's an https top-level resource.
-IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderSSLClientCertTopLevel) {
+IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest,
+                       MAYBE_PrerenderSSLClientCertTopLevel) {
   net::SpawnedTestServer::SSLOptions ssl_options;
   ssl_options.request_client_certificate = true;
   net::SpawnedTestServer https_server(