IPC: Remove unnecessary conversions of BrokerableAttachment.

ipc/attachment_broker_mac_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 <fcntl.h>
 #include <sys/mman.h>
 
 #include "base/command_line.h"
@@ skipping 246 matching lines @@
  private:
   IPC::BrokerableAttachment::AttachmentId id_;
 };
 
 // A broker which always sets the current process as the destination process
 // for attachments.
 class MockBroker : public IPC::AttachmentBrokerUnprivilegedMac {
  public:
   MockBroker() {}
   ~MockBroker() override {}
-  bool SendAttachmentToProcess(IPC::BrokerableAttachment* attachment,
-                               base::ProcessId destination_process) override {
+  bool SendAttachmentToProcess(
+      const scoped_refptr<IPC::BrokerableAttachment>& attachment,
+      base::ProcessId destination_process) override {
     return IPC::AttachmentBrokerUnprivilegedMac::SendAttachmentToProcess(
         attachment, base::Process::Current().Pid());
   }
 };
 
 // Forwards all messages to |listener_|.  Quits the message loop after a
 // message is received, or the channel has an error.
 class ProxyListener : public IPC::Listener {
  public:
   ProxyListener() : listener_(nullptr), reason_(MESSAGE_RECEIVED) {}
@@ skipping 740 matching lines @@
       memcmp(shared_memory2->memory(), kDataBuffer1, strlen(kDataBuffer1)) == 0;
   SendControlMessage(sender, success);
 }
 
 MULTIPROCESS_IPC_TEST_CLIENT_MAIN(ShareReadOnlyToProcess) {
   return CommonPrivilegedProcessMain(&ShareReadOnlyToProcessCallback,
                                      "ShareReadOnlyToProcess");
 }
 
 }  // namespace