Disable flaky test PrerenderBrowserTest.AutosigninInPrerenderer

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 de67ade1c5e41b312dc4d796be7a55534d7b4463..b6f790c852164df2a639e9748964cc31608f7420 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -3217,7 +3217,9 @@ IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, HttpPost) {
 
 // Prerenders a page that tries to automatically sign user in via the Credential
 // Manager API. The page should be killed.
-IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, AutosigninInPrerenderer) {
+//
+// Disabled. See http://crbug.com/660278
+IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, DISABLED_AutosigninInPrerenderer) {
   // Set up a credential in the password store.
   PasswordStoreFactory::GetInstance()->SetTestingFactory(
       current_browser()->profile(),