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

ipc/ipc_channel_factory.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/ipc_channel_factory.h"
 
 namespace IPC {
 
 namespace {
 
 class PlatformChannelFactory : public ChannelFactory {
  public:
   PlatformChannelFactory(ChannelHandle handle,
                          Channel::Mode mode)
       : handle_(handle), mode_(mode) {
   }
 
-  std::string GetName() const override { return handle_.name; }
+  virtual std::string GetName() const override {
+    return handle_.name;
+  }
 
-  scoped_ptr<Channel> BuildChannel(Listener* listener) override {
+  virtual scoped_ptr<Channel> BuildChannel(
+      Listener* listener) override {
     return Channel::Create(handle_, mode_, listener);
   }
 
  private:
   ChannelHandle handle_;
   Channel::Mode mode_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformChannelFactory);
 };
 
 } // namespace
 
 // static
 scoped_ptr<ChannelFactory> ChannelFactory::Create(
     const ChannelHandle& handle, Channel::Mode mode) {
   return scoped_ptr<ChannelFactory>(new PlatformChannelFactory(handle, mode));
 }
 
 }  // namespace IPC