Disable PlatformAppBrowserTest.WindowsApiProperties test on Mac

Disabling this test again as it has shown to keep being flaky even
after the fix in r193825.

BUG=232330,229700
TEST=sanity compile on Linux.
TBR=asargent@chromium.org

Review URL: https://codereview.chromium.org/13996011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194568 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/extensions/api/app_window/app_window_apitest.cc

@@ -125,7 +125,8 @@ IN_PROC_BROWSER_TEST_F(ExperimentalPlatformAppBrowserTest, WindowsApiSetIcon) {
 // don't work under ubuntu unity.
 // (crbug.com/162794 and https://bugs.launchpad.net/unity/+bug/998073).
 // TODO(linux_aura) http://crbug.com/163931
-#if (defined(TOOLKIT_VIEWS) || defined(OS_MACOSX)) && !(defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(USE_AURA))
+// Flaky on Mac, http://crbug.com/232330
+#if defined(TOOLKIT_VIEWS) && !(defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(USE_AURA))
 
 IN_PROC_BROWSER_TEST_F(PlatformAppBrowserTest, WindowsApiProperties) {
   EXPECT_TRUE(