Disable flaky test ThirtyFourTabs on Win

The test has been very flaky on Win:
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=browser_tests%20(with%20patch)&tests=BrowserTest.ThirtyFourTabs

TBR=kylixrd@chromium.org
Bug: 1099186

Change-Id: Icc124244df369a8ac07631ad109d19b22ef436fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559382Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830807}

chrome/browser/ui/browser_browsertest.cc

@@ -521,7 +521,13 @@ IN_PROC_BROWSER_TEST_F(BrowserTest, NoJavaScriptDialogsActivateTab) {
 // verifying that we don't crash when we pass this limit.
 // Warning: this test can take >30 seconds when running on a slow (low
 // memory?) Mac builder.
-IN_PROC_BROWSER_TEST_F(BrowserTest, ThirtyFourTabs) {
+// Test is flaky on Win: https://crbug.com/1099186.
+#if defined(OS_WIN)
+#define MAYBE_ThirtyFourTabs DISABLED_ThirtyFourTabs
+#else
+#define MAYBE_ThirtyFourTabs ThirtyFourTabs
+#endif
+IN_PROC_BROWSER_TEST_F(BrowserTest, MAYBE_ThirtyFourTabs) {
   GURL url(ui_test_utils::GetTestUrl(
       base::FilePath(base::FilePath::kCurrentDirectory),
       base::FilePath(kTitle2File)));