Standardize usage of virtual/override/final in net/

net/dns/host_resolver_proc.h

Index: net/dns/host_resolver_proc.h
diff --git a/net/dns/host_resolver_proc.h b/net/dns/host_resolver_proc.h
index 695e3bc0ec5785ff94bae1332a2e904f02c1ebac..cb61e195df3b39d29393ff59416d48750e003a5a 100644
--- a/net/dns/host_resolver_proc.h
+++ b/net/dns/host_resolver_proc.h
@@ -95,13 +95,14 @@ NET_EXPORT_PRIVATE int SystemHostResolverCall(
 class NET_EXPORT_PRIVATE SystemHostResolverProc : public HostResolverProc {
  public:
   SystemHostResolverProc();
-  virtual int Resolve(const std::string& hostname,
-                      AddressFamily address_family,
-                      HostResolverFlags host_resolver_flags,
-                      AddressList* addr_list,
-                      int* os_error) override;
+  int Resolve(const std::string& hostname,
+              AddressFamily address_family,
+              HostResolverFlags host_resolver_flags,
+              AddressList* addr_list,
+              int* os_error) override;
+
  protected:
-  virtual ~SystemHostResolverProc();
+  ~SystemHostResolverProc() override;
 
   DISALLOW_COPY_AND_ASSIGN(SystemHostResolverProc);
 };