Standardize usage of virtual/override/final specifiers.

net/base/trace_net_log_observer_unittest.cc

 // 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.
 
 #include "net/base/trace_net_log_observer.h"
 
 #include <string>
 #include <vector>
 
 #include "base/debug/trace_event.h"
@@ skipping 42 matching lines @@
  public:
   TraceNetLogObserverTest() {
     TraceLog* tracelog = TraceLog::GetInstance();
     DCHECK(tracelog);
     DCHECK(!tracelog->IsEnabled());
     trace_buffer_.SetOutputCallback(json_output_.GetCallback());
     trace_net_log_observer_.reset(new TraceNetLogObserver());
     trace_events_.reset(new base::ListValue());
   }
 
-  virtual ~TraceNetLogObserverTest() {
+  ~TraceNetLogObserverTest() override {
     DCHECK(!TraceLog::GetInstance()->IsEnabled());
   }
 
   void OnTraceDataCollected(
       base::RunLoop* run_loop,
       const scoped_refptr<base::RefCountedString>& events_str,
       bool has_more_events) {
     DCHECK(trace_events_->empty());
     trace_buffer_.Start();
     trace_buffer_.AddFragment(events_str->data());
@@ skipping 295 matching lines @@
   EXPECT_TRUE(item1->GetString("args.params.foo", &item1_params));
   EXPECT_EQ("bar", item1_params);
 
   EXPECT_TRUE(item2->GetString("args.params", &item2_params));
   EXPECT_TRUE(item2_params.empty());
 }
 
 }  // namespace
 
 }  // namespace net