Standardize usage of virtual/override/final in content/browser/

content/browser/signed_certificate_timestamp_store_impl.h

Index: content/browser/signed_certificate_timestamp_store_impl.h
diff --git a/content/browser/signed_certificate_timestamp_store_impl.h b/content/browser/signed_certificate_timestamp_store_impl.h
index 56007755881ee080b220a3560ac660c6674a0e7f..b2f728a57ddaf892c4ba43e05fd8dc873234885a 100644
--- a/content/browser/signed_certificate_timestamp_store_impl.h
+++ b/content/browser/signed_certificate_timestamp_store_impl.h
@@ -20,10 +20,9 @@ class SignedCertificateTimestampStoreImpl
   static SignedCertificateTimestampStoreImpl* GetInstance();
 
   // SignedCertificateTimestampStore implementation:
-  virtual int Store(
-      net::ct::SignedCertificateTimestamp* sct,
-      int render_process_host_id) override;
-  virtual bool Retrieve(
+  int Store(net::ct::SignedCertificateTimestamp* sct,
+            int render_process_host_id) override;
+  bool Retrieve(
       int sct_id,
       scoped_refptr<net::ct::SignedCertificateTimestamp>* sct) override;
 
@@ -31,7 +30,7 @@ class SignedCertificateTimestampStoreImpl
   friend struct DefaultSingletonTraits<SignedCertificateTimestampStoreImpl>;
 
   SignedCertificateTimestampStoreImpl();
-  virtual ~SignedCertificateTimestampStoreImpl();
+  ~SignedCertificateTimestampStoreImpl() override;
 
   RendererDataMemoizingStore<net::ct::SignedCertificateTimestamp> store_;