Update {virtual,override} to follow C++11 style in net.

net/dns/dns_test_util.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 "net/dns/dns_test_util.h"
 
 #include <string>
 
 #include "base/big_endian.h"
 #include "base/bind.h"
@@ skipping 42 matching lines @@
       if ((rules[i].qtype == qtype) &&
           (hostname.size() >= prefix.size()) &&
           (hostname.compare(0, prefix.size(), prefix) == 0)) {
         result_ = rules[i].result;
         delayed_ = rules[i].delay;
         break;
       }
     }
   }
 
-  virtual const std::string& GetHostname() const override {
-    return hostname_;
-  }
+  const std::string& GetHostname() const override { return hostname_; }
 
-  virtual uint16 GetType() const override {
-    return qtype_;
-  }
+  uint16 GetType() const override { return qtype_; }
 
-  virtual void Start() override {
+  void Start() override {
     EXPECT_FALSE(started_);
     started_ = true;
     if (delayed_)
       return;
     // Using WeakPtr to cleanly cancel when transaction is destroyed.
     base::MessageLoop::current()->PostTask(
         FROM_HERE, base::Bind(&MockTransaction::Finish, AsWeakPtr()));
   }
 
   void FinishDelayedTransaction() {
@@ skipping 138 matching lines @@
 
 AddressSorter* MockDnsClient::GetAddressSorter() {
   return address_sorter_.get();
 }
 
 void MockDnsClient::CompleteDelayedTransactions() {
   factory_->CompleteDelayedTransactions();
 }
 
 }  // namespace net