Standardize usage of virtual/override/final in extensions/

extensions/browser/api/hid/hid_connection_resource.h

Index: extensions/browser/api/hid/hid_connection_resource.h
diff --git a/extensions/browser/api/hid/hid_connection_resource.h b/extensions/browser/api/hid/hid_connection_resource.h
index f98603ea8a7b8f7cd70dacbdd311cfac28d7825f..d2248c4f1d63f59e0163155789038eb3779312b3 100644
--- a/extensions/browser/api/hid/hid_connection_resource.h
+++ b/extensions/browser/api/hid/hid_connection_resource.h
@@ -33,13 +33,13 @@ class HidConnectionResource : public ApiResource {
 
   HidConnectionResource(const std::string& owner_extension_id,
                         scoped_refptr<device::HidConnection> connection);
-  virtual ~HidConnectionResource();
+  ~HidConnectionResource() override;
 
   scoped_refptr<device::HidConnection> connection() const {
     return connection_;
   }
 
-  virtual bool IsPersistent() const override;
+  bool IsPersistent() const override;
 
   static const char* service_name() { return "HidConnectionResourceManager"; }