Revert of Clean up public interface of AttachmentBrokerUnprivileged.

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/macros.h"
@@ skipping 32 matching lines @@
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 
   // Similar to CreateBrokerIfNeeded(), but useful for single process unit tests
   // that don't need real attachment brokering, and don't want to deal with
   // setting up a fake PortProvider.
   static void CreateBrokerForSingleProcessTests();
 
   // AttachmentBroker overrides.
   void RegisterCommunicationChannel(Endpoint* endpoint) override;
   void DeregisterCommunicationChannel(Endpoint* endpoint) override;
-  bool IsPrivilegedBroker() override;
 
  protected:
   // Returns the sender whose peer's process id is |id|.
   // Returns nullptr if no sender is found.
   // The lock returned by get_lock() must already be acquired before calling
   // this method. The return value is only guaranteed to be valid while the lock
   // is held.
   Sender* GetSenderWithProcessId(base::ProcessId id);
 
   // Errors that can be reported by subclasses.
@@ skipping 41 matching lines @@
   void LogError(UMAError error);
 
  private:
   std::vector<Endpoint*> endpoints_;
   DISALLOW_COPY_AND_ASSIGN(AttachmentBrokerPrivileged);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_ATTACHMENT_BROKER_PRIVILEGED_H_