Standardize usage of virtual/override/final in content/

content/child/webcrypto/openssl/key_openssl.h

Index: content/child/webcrypto/openssl/key_openssl.h
diff --git a/content/child/webcrypto/openssl/key_openssl.h b/content/child/webcrypto/openssl/key_openssl.h
index 9d9f61ebd974543f077c56254a9a7a6bc600b4be..00830a68f2a915990ce4b8ecffd8c85e74f053fd 100644
--- a/content/child/webcrypto/openssl/key_openssl.h
+++ b/content/child/webcrypto/openssl/key_openssl.h
@@ -48,7 +48,7 @@ class SymKeyOpenSsl : public KeyOpenSsl {
 
   static SymKeyOpenSsl* Cast(const blink::WebCryptoKey& key);
 
-  virtual SymKeyOpenSsl* AsSymKey() override;
+  SymKeyOpenSsl* AsSymKey() override;
 
   const std::vector<uint8_t>& raw_key_data() const {
     return serialized_key_data();
@@ -66,7 +66,7 @@ class AsymKeyOpenSsl : public KeyOpenSsl {
 
   static AsymKeyOpenSsl* Cast(const blink::WebCryptoKey& key);
 
-  virtual AsymKeyOpenSsl* AsAsymKey() override;
+  AsymKeyOpenSsl* AsAsymKey() override;
 
   EVP_PKEY* key() { return key_.get(); }