Standardize usage of virtual/override/final in chrome/

chrome/common/extensions/manifest_handlers/app_launch_info.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_COMMON_EXTENSIONS_MANIFEST_HANDLERS_APP_LAUNCH_INFO_H_
 #define CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_APP_LAUNCH_INFO_H_
 
 #include <string>
 #include <vector>
 
 #include "chrome/common/extensions/extension_constants.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest.h"
 #include "extensions/common/manifest_handler.h"
 #include "url/gurl.h"
 
 namespace extensions {
 
 // Container that holds the parsed app launch data.
 class AppLaunchInfo : public Extension::ManifestData {
  public:
   AppLaunchInfo();
-  virtual ~AppLaunchInfo();
+  ~AppLaunchInfo() override;
 
   // Get the local path inside the extension to use with the launcher.
   static const std::string& GetLaunchLocalPath(const Extension* extension);
 
   // Get the absolute web url to use with the launcher.
   static const GURL& GetLaunchWebURL(const Extension* extension);
 
   // The window type that an app's manifest specifies to launch into.
   // This is not always the window type an app will open into, because
   // users can override the way each app launches.  See
@@ skipping 26 matching lines @@
   int launch_width_;
   int launch_height_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLaunchInfo);
 };
 
 // Parses all app launch related keys in the manifest.
 class AppLaunchManifestHandler : public ManifestHandler {
  public:
   AppLaunchManifestHandler();
-  virtual ~AppLaunchManifestHandler();
+  ~AppLaunchManifestHandler() override;
 
-  virtual bool Parse(Extension* extension, base::string16* error) override;
-  virtual bool AlwaysParseForType(Manifest::Type type) const override;
+  bool Parse(Extension* extension, base::string16* error) override;
+  bool AlwaysParseForType(Manifest::Type type) const override;
 
  private:
-  virtual const std::vector<std::string> Keys() const override;
+  const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(AppLaunchManifestHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_APP_LAUNCH_INFO_H_