Standardize usage of virtual/override/final in mojo/

mojo/services/network/net_adapters.h

 // 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.
 
 #ifndef MOJO_SERVICES_NETWORK_NET_ADAPTERS_H_
 #define MOJO_SERVICES_NETWORK_NET_ADAPTERS_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "mojo/services/public/interfaces/network/network_error.mojom.h"
@@ skipping 49 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(NetToMojoPendingBuffer);
 };
 
 // Net side of a Net -> Mojo copy. The data will be read from the network and
 // copied into the buffer associated with the pending mojo write.
 class NetToMojoIOBuffer : public net::WrappedIOBuffer {
  public:
   explicit NetToMojoIOBuffer(NetToMojoPendingBuffer* pending_buffer);
 
  private:
-  virtual ~NetToMojoIOBuffer();
+  ~NetToMojoIOBuffer() override;
 
   scoped_refptr<NetToMojoPendingBuffer> pending_buffer_;
 };
 
 // Mojo side of a Mojo -> Net copy.
 class MojoToNetPendingBuffer
     : public base::RefCountedThreadSafe<MojoToNetPendingBuffer> {
  public:
   // Starts reading from Mojo.
   //
@@ skipping 30 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(MojoToNetPendingBuffer);
 };
 
 // Net side of a Mojo -> Net copy. The data will already be in the
 // MojoToNetPendingBuffer's buffer.
 class MojoToNetIOBuffer : public net::WrappedIOBuffer {
  public:
   explicit MojoToNetIOBuffer(MojoToNetPendingBuffer* pending_buffer);
 
  private:
-  virtual ~MojoToNetIOBuffer();
+  ~MojoToNetIOBuffer() override;
 
   scoped_refptr<MojoToNetPendingBuffer> pending_buffer_;
 };
 
 // Creates a new Mojo network error object from a net error code.
 NetworkErrorPtr MakeNetworkError(int error_code);
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_NETWORK_NET_ADAPTERS_H_