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

ipc/mojo/ipc_mojo_bootstrap.cc

Index: ipc/mojo/ipc_mojo_bootstrap.cc
diff --git a/ipc/mojo/ipc_mojo_bootstrap.cc b/ipc/mojo/ipc_mojo_bootstrap.cc
index 745826586e16637ad111fc3e4ecb9b2ca898fd49..7233de0fa2d0259b5389f5e1306397b81f9683fa 100644
--- a/ipc/mojo/ipc_mojo_bootstrap.cc
+++ b/ipc/mojo/ipc_mojo_bootstrap.cc
@@ -20,15 +20,15 @@
  public:
   MojoServerBootstrap();
 
-  void OnClientLaunched(base::ProcessHandle process) override;
+  virtual void OnClientLaunched(base::ProcessHandle process) override;
 
  private:
   void SendClientPipe();
   void SendClientPipeIfReady();
 
   // Listener implementations
-  bool OnMessageReceived(const Message& message) override;
-  void OnChannelConnected(int32 peer_pid) override;
+  virtual bool OnMessageReceived(const Message& message) override;
+  virtual void OnChannelConnected(int32 peer_pid) override;
 
   mojo::embedder::ScopedPlatformHandle server_pipe_;
   base::ProcessHandle client_process_;
@@ -112,12 +112,12 @@
  public:
   MojoClientBootstrap();
 
-  void OnClientLaunched(base::ProcessHandle process) override;
+  virtual void OnClientLaunched(base::ProcessHandle process) override;
 
  private:
   // Listener implementations
-  bool OnMessageReceived(const Message& message) override;
-  void OnChannelConnected(int32 peer_pid) override;
+  virtual bool OnMessageReceived(const Message& message) override;
+  virtual void OnChannelConnected(int32 peer_pid) override;
 
   DISALLOW_COPY_AND_ASSIGN(MojoClientBootstrap);
 };