Disable two components_unittests that fail on ios

components/network_time/network_time_tracker_unittest.cc

Index: components/network_time/network_time_tracker_unittest.cc
diff --git a/components/network_time/network_time_tracker_unittest.cc b/components/network_time/network_time_tracker_unittest.cc
index 408425ec694bd5c681ee9f248331a31dc482eb47..78c0dbccc2ef4aea6ffd9912421f6e337e3ce1fe 100644
--- a/components/network_time/network_time_tracker_unittest.cc
+++ b/components/network_time/network_time_tracker_unittest.cc
@@ -625,7 +625,14 @@ TEST_F(NetworkTimeTrackerTest, UpdateFromNetworkServerError) {
   histograms.ExpectTotalCount(kFetchValidHistogram, 0);
 }
 
-TEST_F(NetworkTimeTrackerTest, UpdateFromNetworkNetworkError) {
+#if defined(OS_IOS)
+// http://crbug.com/658619
+#define MAYBE_UpdateFromNetworkNetworkError     \
+    DISABLED_UpdateFromNetworkNetworkError
+#else
+#define MAYBE_UpdateFromNetworkNetworkError UpdateFromNetworkNetworkError
+#endif
+TEST_F(NetworkTimeTrackerTest, MAYBE_UpdateFromNetworkNetworkError) {
   base::HistogramTester histograms;
   histograms.ExpectTotalCount(kFetchFailedHistogram, 0);
   histograms.ExpectTotalCount(kFetchValidHistogram, 0);