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

chrome/browser/extensions/updater/extension_cache_fake.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_FAKE_H_
 #define CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_FAKE_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "extensions/browser/updater/extension_cache.h"
 
 namespace extensions {
 
 // Fake implementation of extensions ExtensionCache that can be used in tests.
 class ExtensionCacheFake : public ExtensionCache {
  public:
   ExtensionCacheFake();
-  virtual ~ExtensionCacheFake();
+  ~ExtensionCacheFake() override;
 
   // Implementation of ExtensionCache.
-  virtual void Start(const base::Closure& callback) override;
-  virtual void Shutdown(const base::Closure& callback) override;
-  virtual void AllowCaching(const std::string& id) override;
-  virtual bool GetExtension(const std::string& id,
-                            base::FilePath* file_path,
-                            std::string* version) override;
-  virtual void PutExtension(const std::string& id,
-                            const base::FilePath& file_path,
-                            const std::string& version,
-                            const PutExtensionCallback& callback) override;
+  void Start(const base::Closure& callback) override;
+  void Shutdown(const base::Closure& callback) override;
+  void AllowCaching(const std::string& id) override;
+  bool GetExtension(const std::string& id,
+                    base::FilePath* file_path,
+                    std::string* version) override;
+  void PutExtension(const std::string& id,
+                    const base::FilePath& file_path,
+                    const std::string& version,
+                    const PutExtensionCallback& callback) override;
 
  private:
   typedef std::map<std::string, std::pair<std::string, base::FilePath> > Map;
   // Set of extensions that can be cached.
   std::set<std::string> allowed_extensions_;
 
   // Map of know extensions.
   Map cache_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionCacheFake);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_CACHE_FAKE_H_