Standardize usage of virtual/override/final in google_apis/

google_apis/gaia/oauth2_token_service.h

Index: google_apis/gaia/oauth2_token_service.h
diff --git a/google_apis/gaia/oauth2_token_service.h b/google_apis/gaia/oauth2_token_service.h
index 1824da3eac198ee54c4c0ab3eeb6f91f37c6db61..202d7d22505881d6478bcca6e9f68fb2f9584a68 100644
--- a/google_apis/gaia/oauth2_token_service.h
+++ b/google_apis/gaia/oauth2_token_service.h
@@ -215,10 +215,10 @@ class OAuth2TokenService : public base::NonThreadSafe {
    public:
     // |consumer| is required to outlive this.
     explicit RequestImpl(const std::string& account_id, Consumer* consumer);
-    virtual ~RequestImpl();
+    ~RequestImpl() override;
 
     // Overridden from Request:
-    virtual std::string GetAccountId() const override;
+    std::string GetAccountId() const override;
 
     std::string GetConsumerId() const;