Warn on missing OVERRIDE/virtual everywhere, not just in header files.

net/tools/quic/end_to_end_test.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 <stddef.h>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 48 matching lines @@
   explicit ServerThread(IPEndPoint address)
       : SimpleThread("server_thread"),
         listening_(true, false),
         quit_(true, false),
         address_(address),
         port_(0) {
   }
   virtual ~ServerThread() {
   }
 
-  virtual void Run() {
+  virtual void Run() OVERRIDE {
     server_.Listen(address_);
 
     port_lock_.Acquire();
     port_ = server_.port();
     port_lock_.Release();
 
     listening_.Signal();
     while (!quit_.IsSignaled()) {
       server_.WaitForEvents();
     }
@@ skipping 442 matching lines @@
   EXPECT_EQ(200ul, client_->response_headers()->parsed_response_code());
   client_->ResetConnection();
   EXPECT_EQ(kBarResponseBody, client_->SendSynchronousRequest("/bar"));
   EXPECT_EQ(200ul, client_->response_headers()->parsed_response_code());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace tools
 }  // namespace net