Standardize usage of virtual/override/final in chrome/browser/devtools/

chrome/browser/devtools/devtools_targets_ui.h

 // Copyright 2013 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 CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGETS_UI_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGETS_UI_H_
 
 #include <map>
 #include <string>
 
@@ skipping 50 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(DevToolsTargetsUIHandler);
 };
 
 class PortForwardingStatusSerializer
     : private DevToolsAndroidBridge::PortForwardingListener {
  public:
   typedef base::Callback<void(const base::Value&)> Callback;
 
   PortForwardingStatusSerializer(const Callback& callback, Profile* profile);
-  virtual ~PortForwardingStatusSerializer();
+  ~PortForwardingStatusSerializer() override;
 
-  virtual void PortStatusChanged(const ForwardingStatus& status) override;
+  void PortStatusChanged(const ForwardingStatus& status) override;
 
  private:
   Callback callback_;
   Profile* profile_;
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_TARGETS_UI_H_