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

content/browser/storage_partition_impl_map.cc

Index: content/browser/storage_partition_impl_map.cc
diff --git a/content/browser/storage_partition_impl_map.cc b/content/browser/storage_partition_impl_map.cc
index a5ba3462f447c2a9c63d09b49b4d37ce886670b1..d36968b9e280ca09ff60a73eb6bde125a9bd8b2c 100644
--- a/content/browser/storage_partition_impl_map.cc
+++ b/content/browser/storage_partition_impl_map.cc
@@ -58,10 +58,9 @@ class BlobProtocolHandler : public net::URLRequestJobFactory::ProtocolHandler {
         stream_context_(stream_context),
         file_system_context_(file_system_context) {}
 
-  virtual ~BlobProtocolHandler() {
-  }
+  ~BlobProtocolHandler() override {}
 
-  virtual net::URLRequestJob* MaybeCreateJob(
+  net::URLRequestJob* MaybeCreateJob(
       net::URLRequest* request,
       net::NetworkDelegate* network_delegate) const override {
     scoped_refptr<Stream> stream =