Disable NotificationsTest.TestCrashTabWithPermissionInfobar on Windows and Linux

chrome/browser/notifications/notification_browsertest.cc

Index: chrome/browser/notifications/notification_browsertest.cc
diff --git a/chrome/browser/notifications/notification_browsertest.cc b/chrome/browser/notifications/notification_browsertest.cc
index e1f800adfb39c1333b279001ab2bd55056775570..834bff0c5f4ccbb6c52c0ebbc19662563fa4d1f8 100644
--- a/chrome/browser/notifications/notification_browsertest.cc
+++ b/chrome/browser/notifications/notification_browsertest.cc
@@ -671,7 +671,16 @@ IN_PROC_BROWSER_TEST_F(NotificationsTest, TestExitBrowserWithInfobar) {
   ASSERT_TRUE(RequestPermissionAndWait(browser()));
 }
 
-IN_PROC_BROWSER_TEST_F(NotificationsTest, TestCrashTabWithPermissionInfobar) {
+// Times out on Windows and Linux. http://crbug.com/168976
+#if defined(OS_WIN) || defined(OS_LINUX)
+#define MAYBE_TestCrashTabWithPermissionInfobar \
+    DISABLED_TestCrashTabWithPermissionInfobar
+#else
+#define MAYBE_TestCrashTabWithPermissionInfobar \
+    TestCrashTabWithPermissionInfobar
+#endif
+IN_PROC_BROWSER_TEST_F(NotificationsTest,
+                       MAYBE_TestCrashTabWithPermissionInfobar) {
   // Test crashing the tab with permission infobar doesn't crash Chrome.
   ui_test_utils::NavigateToURLWithDisposition(
       browser(),