Disabling flaky test BrowserTest.WindowOpenClose1 on Chrome OS.

TBR=msw@chromium.org

Bug: 823043
Change-Id: I4c113f6630340907aec7870487176a2046f035ac
Reviewed-on: https://chromium-review.googlesource.com/968602Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544024}

chrome/browser/ui/browser_browsertest.cc

@@ -1841,7 +1841,13 @@ IN_PROC_BROWSER_TEST_F(BrowserTest2, NoTabsInPopups) {
 }
 #endif
 
-IN_PROC_BROWSER_TEST_F(BrowserTest, WindowOpenClose1) {
+// Flaky on Chrome OS only. TODO(https://crbug.com/823043) fix it.
+#if defined(OS_CHROMEOS)
+#define MAYBE_WindowOpenClose1 DISABLED_WindowOpenClose1
+#else
+#define MAYBE_WindowOpenClose1 WindowOpenClose1
+#endif
+IN_PROC_BROWSER_TEST_F(BrowserTest, MAYBE_WindowOpenClose1) {
   base::CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kDisablePopupBlocking);
   ASSERT_TRUE(embedded_test_server()->Start());