Stop linking in the old Mojo EDK.

mojo/edk/test/multiprocess_test_helper.cc

Index: mojo/edk/test/multiprocess_test_helper.cc
diff --git a/mojo/edk/test/multiprocess_test_helper.cc b/mojo/edk/test/multiprocess_test_helper.cc
index 0490119abbc227a32bdedcccd05c685379e7b834..18018812b9d696a1db22d7f364e7d33732a1334d 100644
--- a/mojo/edk/test/multiprocess_test_helper.cc
+++ b/mojo/edk/test/multiprocess_test_helper.cc
@@ -24,6 +24,8 @@ namespace test {
 
 const char kBrokerHandleSwitch[] = "broker-handle";
 
+#if !defined(OS_IOS)
+
 MultiprocessTestHelper::MultiprocessTestHelper() {
   platform_channel_pair_.reset(new PlatformChannelPair());
   server_platform_handle = platform_channel_pair_->PassServerHandle();
@@ -125,6 +127,8 @@ void MultiprocessTestHelper::ChildSetup() {
 // static
 ScopedPlatformHandle MultiprocessTestHelper::client_platform_handle;
 
+#endif  // !defined(OS_IOS)
+
 }  // namespace test
 }  // namespace edk
 }  // namespace mojo