Disable WindowedNPAPIPluginHidden tests since they're flaky.

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/location_bar/star_view.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ skipping 70 matching lines @@
   HWND* child = reinterpret_cast<HWND*>(l_param);
   *child = hwnd;
   // The first child window is the plugin, then its children. So stop
   // enumerating after the first callback.
   return FALSE;
 }
 
 // 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);
 
   // First switch to a new tab and back, to also test a scenario where we
   // stopped watching the root window.
   ui_test_utils::NavigateToURLWithDisposition(
       browser(), GURL("about:blank"), NEW_FOREGROUND_TAB,
       ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
   browser()->tab_strip_model()->ActivateTabAt(0, true);
 
@@ skipping 52 matching lines @@
       region_before.left == region_after.left &&
       region_before.top == region_after.top &&
       region_before.right == region_after.right &&
       region_before.bottom == region_after.bottom;
   ASSERT_FALSE(rects_equal);
 }
 
 #endif
 
 }  // namespace