Standardize usage of virtual/override/final in net/

net/dns/dns_config_service_unittest.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_config_service.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/cancelable_callback.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 103 matching lines @@
  public:
   void OnConfigChanged(const DnsConfig& config) {
     last_config_ = config;
     if (quit_on_config_)
       base::MessageLoop::current()->Quit();
   }
 
  protected:
   class TestDnsConfigService : public DnsConfigService {
    public:
-    virtual void ReadNow() override {}
-    virtual bool StartWatching() override { return true; }
+    void ReadNow() override {}
+    bool StartWatching() override { return true; }
 
     // Expose the protected methods to this test suite.
     void InvalidateConfig() {
       DnsConfigService::InvalidateConfig();
     }
 
     void InvalidateHosts() {
       DnsConfigService::InvalidateHosts();
     }
 
@@ skipping 207 matching lines @@
                                  base::Unretained(this)));
   base::TimeDelta kTimeout = TestTimeouts::action_max_timeout();
   WaitForConfig(kTimeout);
   ASSERT_TRUE(last_config_.IsValid()) << "Did not receive DnsConfig in " <<
       kTimeout.InSecondsF() << "s";
 }
 #endif  // OS_POSIX || OS_WIN
 
 }  // namespace net