Standardize usage of virtual/override/final in chrome/

chrome/common/extensions/api/input_ime/input_components_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 CHROME_COMMON_EXTENSIONS_API_INPUT_IME_INPUT_COMPONENTS_HANDLER_H_
 #define CHROME_COMMON_EXTENSIONS_API_INPUT_IME_INPUT_COMPONENTS_HANDLER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 27 matching lines @@
   bool shortcut_alt;
   bool shortcut_ctrl;
   bool shortcut_shift;
   GURL options_page_url;
   GURL input_view_url;
 };
 
 struct InputComponents : public Extension::ManifestData {
   // Define out of line constructor/destructor to please Clang.
   InputComponents();
-  virtual ~InputComponents();
+  ~InputComponents() override;
 
   std::vector<InputComponentInfo> input_components;
 
   // Returns list of input components and associated properties.
   static const std::vector<InputComponentInfo>* GetInputComponents(
       const Extension* extension);
 };
 
 // Parses the "incognito" manifest key.
 class InputComponentsHandler : public ManifestHandler {
  public:
   InputComponentsHandler();
-  virtual ~InputComponentsHandler();
+  ~InputComponentsHandler() override;
 
-  virtual bool Parse(Extension* extension, base::string16* error) override;
+  bool Parse(Extension* extension, base::string16* error) override;
 
   // Requires kOptionsPage is already parsed.
-  virtual const std::vector<std::string> PrerequisiteKeys() const override;
+  const std::vector<std::string> PrerequisiteKeys() const override;
 
  private:
-  virtual const std::vector<std::string> Keys() const override;
+  const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(InputComponentsHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_API_INPUT_IME_INPUT_COMPONENTS_HANDLER_H_