Standardize usage of virtual/override/final in content/browser/

content/browser/devtools/devtools_tracing_handler.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_TRACING_HANDLER_H_
 #define CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_TRACING_HANDLER_H_
 
 #include <set>
 #include <string>
 
 #include "base/debug/trace_event.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/devtools/devtools_protocol.h"
 #include "content/public/browser/tracing_controller.h"
 
 namespace base {
 class RefCountedString;
 class Timer;
 }
 
 namespace content {
 
 // This class bridges DevTools remote debugging server with the trace
 // infrastructure.
 class DevToolsTracingHandler : public DevToolsProtocol::Handler {
  public:
   enum Target { Browser, Renderer };
   explicit DevToolsTracingHandler(Target target);
-  virtual ~DevToolsTracingHandler();
+  ~DevToolsTracingHandler() override;
 
   void OnClientDetached();
 
   void OnTraceDataCollected(const std::string& trace_fragment);
   void OnTraceComplete();
 
  private:
   void OnRecordingEnabled(scoped_refptr<DevToolsProtocol::Command> command);
   void OnBufferUsage(float usage);
 
@@ skipping 23 matching lines @@
   static const double kMinimumReportingInterval;
 
   base::WeakPtrFactory<DevToolsTracingHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsTracingHandler);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_DEVTOOLS_TRACING_HANDLER_H_