mac: Make Mach port scopers better ScopedGenerics

content/browser/browser_io_surface_manager_mac.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 "content/browser/browser_io_surface_manager_mac.h"
 
 #include <servers/bootstrap.h>
 
 #include <string>
 
@@ skipping 174 matching lines @@
       IOSurfaceManagerHostMsg_UnregisterIOSurface unregister_io_surface;
       IOSurfaceManagerHostMsg_AcquireIOSurface acquire_io_surface;
     } msg;
     mach_msg_trailer_t trailer;
   } request = {{{0}}};
   request.msg.header.msgh_size = sizeof(request);
   request.msg.header.msgh_local_port = server_port_.get();
 
   kern_return_t kr =
       mach_msg(&request.msg.header, MACH_RCV_MSG, 0, sizeof(request),
-               server_port_, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
+               server_port_.get(), MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
   if (kr != KERN_SUCCESS) {
     MACH_LOG(ERROR, kr) << "mach_msg";
     return;
   }
 
   union {
     mach_msg_header_t header;
     IOSurfaceManagerMsg_RegisterIOSurfaceReply register_io_surface;
     IOSurfaceManagerMsg_AcquireIOSurfaceReply acquire_io_surface;
   } reply = {{0}};
@@ skipping 105 matching lines @@
     return;
   }
 
   reply->body.msgh_descriptor_count = 1;
   reply->io_surface_port.name = it->second->get();
   reply->io_surface_port.disposition = MACH_MSG_TYPE_COPY_SEND;
   reply->io_surface_port.type = MACH_MSG_PORT_DESCRIPTOR;
 }
 
 }  // namespace content