Stop linking in the old Mojo EDK.

mojo/edk/test/multiprocess_test_helper.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/edk/test/multiprocess_test_helper.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "build/build_config.h"
 #include "mojo/edk/embedder/embedder.h"
 #include "mojo/edk/embedder/platform_channel_pair.h"
 
 #if defined(OS_WIN)
 #include "base/win/windows_version.h"
 #endif
 
 namespace mojo {
 namespace edk {
 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();
   broker_platform_channel_pair_.reset(new PlatformChannelPair());
 }
 
 MultiprocessTestHelper::~MultiprocessTestHelper() {
   CHECK(!test_child_.IsValid());
   server_platform_handle.reset();
   platform_channel_pair_.reset();
@@ skipping 81 matching lines @@
           kBrokerHandleSwitch);
   ScopedPlatformHandle broker_handle =
       PlatformChannelPair::PassClientHandleFromParentProcessFromString(
           broker_handle_str);
   SetParentPipeHandle(std::move(broker_handle));
 }
 
 // static
 ScopedPlatformHandle MultiprocessTestHelper::client_platform_handle;
 
+#endif  // !defined(OS_IOS)
+
 }  // namespace test
 }  // namespace edk
 }  // namespace mojo