Disable flaky test TestClickingOnOverflowedAction on Windows

chrome/browser/ui/views/toolbar/toolbar_action_view_interactive_uitest.cc

 // Copyright 2015 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 "base/location.h"
 #include "base/macros.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 151 matching lines @@
   // are constructed.
   feature_override_.reset(new extensions::FeatureSwitch::ScopedOverride(
       extensions::FeatureSwitch::extension_action_redesign(), true));
   ToolbarActionsBar::disable_animations_for_testing_ = true;
 }
 
 void ToolbarActionViewInteractiveUITest::TearDownOnMainThread() {
   ToolbarActionsBar::disable_animations_for_testing_ = false;
 }
 
-#if defined(USE_OZONE)
+#if defined(USE_OZONE) || defined(OS_WIN)
 // ozone bringup - http://crbug.com/401304
+// flaky on Windows - http://crbug.com/638692
 #define MAYBE_TestClickingOnOverflowedAction DISABLED_TestClickingOnOverflowedAction
 #else
 #define MAYBE_TestClickingOnOverflowedAction TestClickingOnOverflowedAction
 #endif
 // Tests clicking on an overflowed extension action.
 IN_PROC_BROWSER_TEST_F(ToolbarActionViewInteractiveUITest,
                        MAYBE_TestClickingOnOverflowedAction) {
   // Load an extension.
   ASSERT_TRUE(LoadExtension(
       test_data_dir_.AppendASCII("ui").AppendASCII("browser_action_popup")));
@@ skipping 203 matching lines @@
   ui_controls::SendKeyPressNotifyWhenDone(native_window, ui::VKEY_RETURN, false,
                                           false, false, false,
                                           loop.QuitClosure());
   loop.Run();
 
   // The menu should be closed.
   EXPECT_FALSE(app_menu_button->IsMenuShowing());
   // And the extension should have been activated.
   EXPECT_TRUE(listener.WaitUntilSatisfied());
 }