Disable ServiceWorkerPushMessagingTest.OnPush on chromeos

chrome/browser/extensions/service_worker_apitest.cc

Index: chrome/browser/extensions/service_worker_apitest.cc
diff --git a/chrome/browser/extensions/service_worker_apitest.cc b/chrome/browser/extensions/service_worker_apitest.cc
index 08cc9ad314c12d8a2bb1b0dfe6957843a8dc27b8..912a371fd87f289296df58fc9359d05c3148c653 100644
--- a/chrome/browser/extensions/service_worker_apitest.cc
+++ b/chrome/browser/extensions/service_worker_apitest.cc
@@ -697,7 +697,13 @@ IN_PROC_BROWSER_TEST_F(ServiceWorkerTest,
       << message_;
 }
 
-IN_PROC_BROWSER_TEST_F(ServiceWorkerPushMessagingTest, OnPush) {
+// Flaky on ChromiumOS bots. http://crbug.com/612673
+#if defined(OS_CHROMEOS)
+#define MAYBE_OnPush DISABLED_OnPush
+#else
+#define MAYBE_OnPush OnPush
+#endif
+IN_PROC_BROWSER_TEST_F(ServiceWorkerPushMessagingTest, MAYBE_OnPush) {
   const Extension* extension = LoadExtensionWithFlags(
       test_data_dir_.AppendASCII("service_worker/push_messaging"), kFlagNone);
   ASSERT_TRUE(extension);