Standardize usage of virtual/override/final in extensions/

extensions/common/api/sockets/sockets_manifest_permission.h

Index: extensions/common/api/sockets/sockets_manifest_permission.h
diff --git a/extensions/common/api/sockets/sockets_manifest_permission.h b/extensions/common/api/sockets/sockets_manifest_permission.h
index 15b2044a1e126d024530cd3df8e6f68c6e9a523f..d636f224294489d8171c50f8c78be005a93151f2 100644
--- a/extensions/common/api/sockets/sockets_manifest_permission.h
+++ b/extensions/common/api/sockets/sockets_manifest_permission.h
@@ -26,7 +26,7 @@ class SocketsManifestPermission : public ManifestPermission {
  public:
   typedef std::set<SocketPermissionEntry> SocketPermissionEntrySet;
   SocketsManifestPermission();
-  virtual ~SocketsManifestPermission();
+  ~SocketsManifestPermission() override;
 
   // Tries to construct the info based on |value|, as it would have appeared in
   // the manifest. Sets |error| and returns an empty scoped_ptr on failure.
@@ -40,18 +40,15 @@ class SocketsManifestPermission : public ManifestPermission {
   void AddPermission(const SocketPermissionEntry& entry);
 
   // extensions::ManifestPermission overrides.
-  virtual std::string name() const override;
-  virtual std::string id() const override;
-  virtual bool HasMessages() const override;
-  virtual PermissionMessages GetMessages() const override;
-  virtual bool FromValue(const base::Value* value) override;
-  virtual scoped_ptr<base::Value> ToValue() const override;
-  virtual ManifestPermission* Diff(const ManifestPermission* rhs) const
-      override;
-  virtual ManifestPermission* Union(const ManifestPermission* rhs) const
-      override;
-  virtual ManifestPermission* Intersect(const ManifestPermission* rhs) const
-      override;
+  std::string name() const override;
+  std::string id() const override;
+  bool HasMessages() const override;
+  PermissionMessages GetMessages() const override;
+  bool FromValue(const base::Value* value) override;
+  scoped_ptr<base::Value> ToValue() const override;
+  ManifestPermission* Diff(const ManifestPermission* rhs) const override;
+  ManifestPermission* Union(const ManifestPermission* rhs) const override;
+  ManifestPermission* Intersect(const ManifestPermission* rhs) const override;
 
   const SocketPermissionEntrySet& entries() const { return permissions_; }