Disable SendAlgorithmTest on iOS.

SendAlgorithmTest tests are failing on iOS due to a memory issue. This
CL disabled them to make the tree green.

TBR=rch

Bug: 775492
Change-Id: I179b0a56495335008c728fa6054f6159236470cd
Reviewed-on: https://chromium-review.googlesource.com/724619Reviewed-by: Gregory Chatzinoff <gchatz@chromium.org>
Commit-Queue: Gregory Chatzinoff <gchatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509649}

net/quic/core/congestion_control/send_algorithm_test.cc

@@ -23,8 +23,8 @@
 #include "net/quic/test_tools/simulator/simulator.h"
 #include "net/quic/test_tools/simulator/switch.h"
 
-// TODO(vasilvv): make this tests not time out on Android.
-#if !defined(OS_ANDROID)
+// TODO(vasilvv): make this tests not time out on Android and iOS.
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
 
 using std::string;
 
@@ -436,4 +436,4 @@ TEST_P(SendAlgorithmTest, LowRTTTransfer) {
 }  // namespace test
 }  // namespace net
 
-#endif  // !defined(OS_ANDROID)
+#endif  // !defined(OS_ANDROID) && !defined(OS_IOS)