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

ipc/ipc_fuzzing_tests.cc

 // Copyright (c) 2012 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 <stdio.h>
 #include <string>
 #include <sstream>
 
 #include "base/message_loop/message_loop.h"
 #include "base/threading/platform_thread.h"
@@ skipping 117 matching lines @@
   FUZZER_ROUTING_ID = 5
 };
 
 // The fuzzer server class. It runs in a child process and expects
 // only two IPC calls; after that it exits the message loop which
 // terminates the child process.
 class FuzzerServerListener : public SimpleListener {
  public:
   FuzzerServerListener() : message_count_(2), pending_messages_(0) {
   }
-  bool OnMessageReceived(const IPC::Message& msg) override {
+  virtual bool OnMessageReceived(const IPC::Message& msg) override {
     if (msg.routing_id() == MSG_ROUTING_CONTROL) {
       ++pending_messages_;
       IPC_BEGIN_MESSAGE_MAP(FuzzerServerListener, msg)
         IPC_MESSAGE_HANDLER(MsgClassIS, OnMsgClassISMessage)
         IPC_MESSAGE_HANDLER(MsgClassSI, OnMsgClassSIMessage)
       IPC_END_MESSAGE_MAP()
       if (pending_messages_) {
         // Probably a problem de-serializing the message.
         ReplyMsgNotHandled(msg.type());
       }
@@ skipping 43 matching lines @@
 
   int message_count_;
   int pending_messages_;
 };
 
 class FuzzerClientListener : public SimpleListener {
  public:
   FuzzerClientListener() : last_msg_(NULL) {
   }
 
-  bool OnMessageReceived(const IPC::Message& msg) override {
+  virtual bool OnMessageReceived(const IPC::Message& msg) override {
     last_msg_ = new IPC::Message(msg);
     base::MessageLoop::current()->Quit();
     return true;
   }
 
   bool ExpectMessage(int value, uint32 type_id) {
     if (!MsgHandlerInternal(type_id))
       return false;
     int msg_value1 = 0;
     int msg_value2 = 0;
@@ skipping 126 matching lines @@
   // thrown out of sync by the extra argument.
   msg = new MsgClassIS(3, L"expect three");
   sender()->Send(msg);
   EXPECT_TRUE(listener.ExpectMessage(3, MsgClassIS::ID));
 
   EXPECT_TRUE(WaitForClientShutdown());
   DestroyChannel();
 }
 
 }  // namespace