Disabling a flaky test (SingleMetaRefreshRedirectTargetBlank) on Linux.

chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc

Index: chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc
diff --git a/chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc b/chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc
index dd7eb32f57217d98049bbb5a605dfc01b813de73..ac8cfd48ddf77c2ab022a298c6383971b63a93e6 100644
--- a/chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc
+++ b/chrome/browser/safe_browsing/safe_browsing_navigation_observer_browsertest.cc
@@ -295,10 +295,16 @@ IN_PROC_BROWSER_TEST_F(SBNavigationObserverBrowserTest,
   VerifyHostToIpMap();
 }
 
+// https://crbug.com/667784: The test is flaky on Linux.
+#if defined(OS_LINUX)
+#define MAYBE_SingleMetaRefreshRedirect DISABLED_SingleMetaRefreshRedirect
+#else
+#define MAYBE_SingleMetaRefreshRedirect SingleMetaRefreshRedirect
+#endif
 // Click on a link which navigates to a page then redirects to a download using
 // META HTTP-EQUIV="refresh". All transitions happen in the same tab.
 IN_PROC_BROWSER_TEST_F(SBNavigationObserverBrowserTest,
-                       SingleMetaRefreshRedirect) {
+                       MAYBE_SingleMetaRefreshRedirect) {
   ClickTestLink("single_meta_refresh_redirect", 2);
   GURL initial_url = embedded_test_server()->GetURL(kSingleFrameTestURL);
   GURL redirect_url = embedded_test_server()->GetURL(kRedirectURL);