Mark WorkerTest.MultipleTabsQueuedSharedWorker as flaky.

chrome/worker/worker_uitest.cc

Index: chrome/worker/worker_uitest.cc
diff --git a/chrome/worker/worker_uitest.cc b/chrome/worker/worker_uitest.cc
index abbf0b2711eea5366135cb6472b92a7c049f7a8a..2d8c5296471406d59eb40e147371186a1d4889a1 100644
--- a/chrome/worker/worker_uitest.cc
+++ b/chrome/worker/worker_uitest.cc
@@ -578,7 +578,8 @@ TEST_F(WorkerTest, QueuedSharedWorkerShutdown) {
   ASSERT_TRUE(WaitForProcessCountToBe(1, max_workers_per_tab));
 }
 
-TEST_F(WorkerTest, MultipleTabsQueuedSharedWorker) {
+// Flaky, http://crbug.com/35221.
+TEST_F(WorkerTest, FLAKY_MultipleTabsQueuedSharedWorker) {
   // Tests to make sure that only one instance of queued shared workers are
   // started up even when those instances are on multiple tabs.
   int max_workers_per_tab = WorkerService::kMaxWorkersPerTabWhenSeparate;