Disabled flaky WindowDotPrintShouldBringUpPrintPreview test on mac.

chrome/browser/apps/app_browsertest.cc

 // Copyright 2013 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 "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "apps/common/api/app_runtime.h"
 #include "apps/launcher.h"
 #include "apps/ui/native_app_window.h"
 #include "base/bind.h"
@@ skipping 1084 matching lines @@
   LoadAndLaunchPlatformApp("minimal");
   ASSERT_TRUE(launched_listener.WaitUntilSatisfied());
 
   EXPECT_EQ(1LU, GetAppWindowCount());
   EXPECT_TRUE(GetFirstAppWindow()
                   ->web_contents()
                   ->GetRenderWidgetHostView()
                   ->HasFocus());
 }
 
-#if defined(OS_WIN) || defined(OS_LINUX)
+#if defined(OS_WIN) || defined(OS_LINUX) || defined(OS_MACOSX)
 #define MAYBE_WindowDotPrintShouldBringUpPrintPreview \
     DISABLED_WindowDotPrintShouldBringUpPrintPreview
 #else
 #define MAYBE_WindowDotPrintShouldBringUpPrintPreview \
     WindowDotPrintShouldBringUpPrintPreview
 #endif
 
 IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest,
                        MAYBE_WindowDotPrintShouldBringUpPrintPreview) {
   ScopedPreviewTestingDelegate preview_delegate(true);
@@ skipping 201 matching lines @@
 
     ExtensionApiTest::ResultCatcher result_catcher;
 
     ASSERT_TRUE(launched_listener.WaitUntilSatisfied());
 
     EXPECT_TRUE(result_catcher.GetNextResult());
   }
 }
 
 }  // namespace extensions