Standardize usage of virtual/override/final in extensions/

extensions/common/features/complex_feature.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 EXTENSIONS_COMMON_FEATURES_COMPLEX_FEATURE_H_
 #define EXTENSIONS_COMMON_FEATURES_COMPLEX_FEATURE_H_
 
 #include <set>
 #include <string>
 
 #include "base/memory/scoped_vector.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/features/feature.h"
 #include "extensions/common/manifest.h"
 
 namespace extensions {
 
 // A ComplexFeature is composed of one or many Features. A ComplexFeature
 // is available if any Feature (i.e. permission rule) that composes it is
 // available, but not if only some combination of Features is available.
 class ComplexFeature : public Feature {
  public:
   typedef ScopedVector<Feature> FeatureList;
 
   explicit ComplexFeature(scoped_ptr<FeatureList> features);
-  virtual ~ComplexFeature();
+  ~ComplexFeature() override;
 
   // extensions::Feature:
-  virtual Availability IsAvailableToManifest(const std::string& extension_id,
-                                             Manifest::Type type,
-                                             Manifest::Location location,
-                                             int manifest_version,
-                                             Platform platform) const override;
+  Availability IsAvailableToManifest(const std::string& extension_id,
+                                     Manifest::Type type,
+                                     Manifest::Location location,
+                                     int manifest_version,
+                                     Platform platform) const override;
 
-  virtual Availability IsAvailableToContext(const Extension* extension,
-                                            Context context,
-                                            const GURL& url,
-                                            Platform platform) const override;
+  Availability IsAvailableToContext(const Extension* extension,
+                                    Context context,
+                                    const GURL& url,
+                                    Platform platform) const override;
 
-  virtual bool IsIdInBlacklist(const std::string& extension_id) const override;
-  virtual bool IsIdInWhitelist(const std::string& extension_id) const override;
+  bool IsIdInBlacklist(const std::string& extension_id) const override;
+  bool IsIdInWhitelist(const std::string& extension_id) const override;
 
  protected:
   // extensions::Feature:
-  virtual std::string GetAvailabilityMessage(
-      AvailabilityResult result,
-      Manifest::Type type,
-      const GURL& url,
-      Context context) const override;
+  std::string GetAvailabilityMessage(AvailabilityResult result,
+                                     Manifest::Type type,
+                                     const GURL& url,
+                                     Context context) const override;
 
-  virtual bool IsInternal() const override;
+  bool IsInternal() const override;
 
  private:
   FeatureList features_;
 
   DISALLOW_COPY_AND_ASSIGN(ComplexFeature);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_FEATURES_COMPLEX_FEATURE_H_