Mark TaskManagerBrowserTest.ShutdownWhileOpen flaky on ChromeOS.

chrome/browser/task_manager/task_manager_browsertest.cc

Index: chrome/browser/task_manager/task_manager_browsertest.cc
diff --git a/chrome/browser/task_manager/task_manager_browsertest.cc b/chrome/browser/task_manager/task_manager_browsertest.cc
index ee0e8fc6c77a349df68a0835abbb126d4db6b443..ab95d3ce9d853430af82f835c7959f5aa12f8fac 100644
--- a/chrome/browser/task_manager/task_manager_browsertest.cc
+++ b/chrome/browser/task_manager/task_manager_browsertest.cc
@@ -56,8 +56,16 @@ class TaskManagerBrowserTest : public ExtensionBrowserTest {
   }
 };
 
+// Flaky on ChromeOS (triggers pure virtual function call), see
+// http://crbug.com/92297 for details
+#if defined(OS_CHROMEOS)
+#define MAYBE_ShutdownWhileOpen FLAKY_ShutdownWhileOpen
+#else
+#define MAYBE_ShutdownWhileOpen ShutdownWhileOpen
+#endif
+
 // Regression test for http://crbug.com/13361
-IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, ShutdownWhileOpen) {
+IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, MAYBE_ShutdownWhileOpen) {
   browser()->window()->ShowTaskManager();
 }