ipc: Write end-to-end tests for SharedMemoryHandle brokering on Mac.

ipc/attachment_broker_privileged_win_unittest.cc

 // Copyright 2015 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 "build/build_config.h"
 
 #include <windows.h>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 208 matching lines @@
 
   // Takes ownership of |broker|. Has no effect if called after CommonSetUp().
   void set_broker(IPC::AttachmentBrokerUnprivilegedWin* broker) {
     broker_.reset(broker);
   }
 
   void CommonSetUp() {
     if (!broker_.get())
       set_broker(new IPC::AttachmentBrokerUnprivilegedWin);
     broker_->AddObserver(&observer_);
-    set_attachment_broker(broker_.get());
     CreateChannel(&proxy_listener_);
     broker_->DesignateBrokerCommunicationChannel(channel());
     ASSERT_TRUE(ConnectChannel());
     ASSERT_TRUE(StartClient());
   }
 
   void CommonTearDown() {
     // Close the channel so the client's OnChannelError() gets fired.
     channel()->Close();
 
@@ skipping 313 matching lines @@
     SendControlMessage(sender, success);
   }
 }
 
 MULTIPROCESS_IPC_TEST_CLIENT_MAIN(SendHandleTwice) {
   return CommonPrivilegedProcessMain(&SendHandleTwiceCallback,
                                      "SendHandleTwice");
 }
 
 }  // namespace