Disable flaky test on Windows as well.

ui/views/widget/widget_unittest.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 <algorithm>
 #include <memory>
 #include <set>
 
 #include "base/bind.h"
 #include "base/macros.h"
@@ skipping 1372 matching lines @@
   widget.InitForTest(CreateParams(Widget::InitParams::TYPE_WINDOW_FRAMELESS));
   RunPendingMessages();
   EXPECT_TRUE(widget.ReadReceivedPaintAndReset());
   widget.SchedulePaintInRect(widget.GetRestoredBounds());
   widget.Close();
   RunPendingMessages();
   EXPECT_FALSE(widget.ReadReceivedPaintAndReset());
   EXPECT_FALSE(widget.received_paint_while_hidden());
 }
 
-#if defined(OS_LINUX)
+// Flaky; see https://crbug.com/596039.
+#if defined(OS_LINUX) || defined(OS_WIN)
 #define MAYBE_DesktopNativeWidgetNoPaintAfterHideTest DISABLED_DesktopNativeWidgetNoPaintAfterHideTest
 #else
 #define MAYBE_DesktopNativeWidgetNoPaintAfterHideTest DesktopNativeWidgetNoPaintAfterHideTest
 #endif
 TEST_F(WidgetTest, MAYBE_DesktopNativeWidgetNoPaintAfterHideTest) {
   DesktopAuraTestValidPaintWidget widget;
   widget.InitForTest(CreateParams(Widget::InitParams::TYPE_WINDOW_FRAMELESS));
   RunPendingMessages();
   EXPECT_TRUE(widget.ReadReceivedPaintAndReset());
   widget.SchedulePaintInRect(widget.GetRestoredBounds());
@@ skipping 2307 matching lines @@
   EXPECT_FALSE(!!IsWindow(owned_hwnd));
   EXPECT_TRUE(!!IsWindowEnabled(top_hwnd));
 
   top_level_widget.CloseNow();
 }
 
 #endif  // defined(OS_WIN)
 
 }  // namespace test
 }  // namespace views