Disable RequestCoordinatorTest.PauseAndResumeObserver on IOS

components/offline_pages/background/request_coordinator_unittest.cc

Index: components/offline_pages/background/request_coordinator_unittest.cc
diff --git a/components/offline_pages/background/request_coordinator_unittest.cc b/components/offline_pages/background/request_coordinator_unittest.cc
index 575c77136aa0baaa5ac734d06c661b06f47f9793..a3f7935676d7da373f84d2036102f8ce9c4ff4cd 100644
--- a/components/offline_pages/background/request_coordinator_unittest.cc
+++ b/components/offline_pages/background/request_coordinator_unittest.cc
@@ -1257,7 +1257,13 @@ TEST_F(RequestCoordinatorTest, GetAllRequests) {
   EXPECT_EQ(kRequestId2, last_requests().at(1)->request_id());
 }
 
-TEST_F(RequestCoordinatorTest, PauseAndResumeObserver) {
+#if defined(OS_IOS)
+// Flaky on IOS. http://crbug/663311
+#define MAYBE_PauseAndResumeObserver DISABLED_PauseAndResumeObserver
+#else
+#define MAYBE_PauseAndResumeObserver PauseAndResumeObserver
+#endif
+TEST_F(RequestCoordinatorTest, MAYBE_PauseAndResumeObserver) {
   // Add a request to the queue.
   offline_pages::SavePageRequest request1(kRequestId1, kUrl1, kClientId1,
                                           base::Time::Now(), kUserRequested);