Revert of Standardize usage of virtual/override/final in ipc/

ipc/mojo/ipc_channel_mojo_host.cc

 // Copyright 2014 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 "ipc/mojo/ipc_channel_mojo_host.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "ipc/mojo/ipc_channel_mojo.h"
 
 namespace IPC {
 
 // The delete class lives on the IO thread to talk to ChannelMojo on
 // behalf of ChannelMojoHost.
 //
 // The object must be touched only on the IO thread.
 class ChannelMojoHost::ChannelDelegate : public ChannelMojo::Delegate {
  public:
   explicit ChannelDelegate(scoped_refptr<base::TaskRunner> io_task_runner);
-  ~ChannelDelegate() override;
+  virtual ~ChannelDelegate();
 
   // ChannelMojo::Delegate
-  base::WeakPtr<Delegate> ToWeakPtr() override;
-  void OnChannelCreated(base::WeakPtr<ChannelMojo> channel) override;
-  scoped_refptr<base::TaskRunner> GetIOTaskRunner() override;
+  virtual base::WeakPtr<Delegate> ToWeakPtr() override;
+  virtual void OnChannelCreated(base::WeakPtr<ChannelMojo> channel) override;
+  virtual scoped_refptr<base::TaskRunner> GetIOTaskRunner() override;
 
   // Returns an weak ptr of ChannelDelegate instead of Delegate
   base::WeakPtr<ChannelDelegate> GetWeakPtr();
   void OnClientLaunched(base::ProcessHandle process);
   void DeleteThisSoon();
 
  private:
   scoped_refptr<base::TaskRunner> io_task_runner_;
   base::WeakPtr<ChannelMojo> channel_;
   base::WeakPtrFactory<ChannelDelegate> weak_factory_;
@@ skipping 70 matching lines @@
 ChannelMojo::Delegate* ChannelMojoHost::channel_delegate() const {
   return channel_delegate_.get();
 }
 
 void ChannelMojoHost::DelegateDeleter::operator()(
     ChannelMojoHost::ChannelDelegate* ptr) const {
   ptr->DeleteThisSoon();
 }
 
 }  // namespace IPC