Disable WindowedNPAPIPluginHidden tests since they're flaky.

chrome/browser/ui/views/location_bar/star_view_browsertest.cc

Index: chrome/browser/ui/views/location_bar/star_view_browsertest.cc
diff --git a/chrome/browser/ui/views/location_bar/star_view_browsertest.cc b/chrome/browser/ui/views/location_bar/star_view_browsertest.cc
index 87a14ebff6f07a410cacda9af9a3ab9034703198..383df2bc164709c479dd5bb3f04c0d74a3cdd001 100644
--- a/chrome/browser/ui/views/location_bar/star_view_browsertest.cc
+++ b/chrome/browser/ui/views/location_bar/star_view_browsertest.cc
@@ -88,7 +88,8 @@ BOOL CALLBACK EnumerateChildren(HWND hwnd, LPARAM l_param) {
 // Ensure that UIs like the star window, user profiler picker, omnibox
 // popup and bookmark editor are always over a windowed NPAPI plugin even if
 // kDisableDwmComposition is used.
-IN_PROC_BROWSER_TEST_F(StarViewTestNoDWM, WindowedNPAPIPluginHidden) {
+// flaky: http://crbug.com/406631
+IN_PROC_BROWSER_TEST_F(StarViewTestNoDWM, DISABLED_WindowedNPAPIPluginHidden) {
   browser()->profile()->GetPrefs()->SetBoolean(prefs::kPluginsAlwaysAuthorize,
                                                true);