Standardize usage of virtual/override/final in content/

content/child/webcrypto/openssl/sha_openssl.cc

Index: content/child/webcrypto/openssl/sha_openssl.cc
diff --git a/content/child/webcrypto/openssl/sha_openssl.cc b/content/child/webcrypto/openssl/sha_openssl.cc
index 9e1b9044cc431fc572d0bdb314c712ab319c1f6d..8218dd96aeed4c642a6689e012035fd1241b7be7 100644
--- a/content/child/webcrypto/openssl/sha_openssl.cc
+++ b/content/child/webcrypto/openssl/sha_openssl.cc
@@ -111,9 +111,9 @@ class DigestorOpenSsl : public blink::WebCryptoDigestor {
 
 class ShaImplementation : public AlgorithmImplementation {
  public:
-  virtual Status Digest(const blink::WebCryptoAlgorithm& algorithm,
-                        const CryptoData& data,
-                        std::vector<uint8_t>* buffer) const override {
+  Status Digest(const blink::WebCryptoAlgorithm& algorithm,
+                const CryptoData& data,
+                std::vector<uint8_t>* buffer) const override {
     DigestorOpenSsl digestor(algorithm.id());
     Status error = digestor.ConsumeWithStatus(data.bytes(), data.byte_length());
     // http://crbug.com/366427: the spec does not define any other failures for