ipc: Minor fixes to AttachmentBrokerPrivilegedMac.

ipc/attachment_broker_privileged.h

 // 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.
 
 #ifndef IPC_ATTACHMENT_BROKER_PRIVILEGED_H_
 #define IPC_ATTACHMENT_BROKER_PRIVILEGED_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 61 matching lines @@
     // Couldn't change the attributes of a Mach port.
     ERROR_SET_ATTRIBUTES = 7,
     // Couldn't extract a right from the destination.
     ERROR_EXTRACT_DEST_RIGHT = 8,
     // Couldn't send a Mach port in a call to mach_msg().
     ERROR_SEND_MACH_PORT = 9,
     // Couldn't decrease the ref count on a Mach port.
     ERROR_DECREASE_REF = 10,
     // Couldn't extract a right from the source.
     ERROR_EXTRACT_SOURCE_RIGHT = 11,
+    // The broker did not have a channel of communication with the source
+    // process.
+    ERROR_SOURCE_NOT_FOUND = 12,
     ERROR_MAX
   };
 
   // Emits an UMA metric.
   void LogError(UMAError error);
 
  private:
   std::vector<Endpoint*> endpoints_;
   DISALLOW_COPY_AND_ASSIGN(AttachmentBrokerPrivileged);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_ATTACHMENT_BROKER_PRIVILEGED_H_