Update from https://crrev.com/309717

sandbox/linux/seccomp-bpf/errorcode_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/linux/seccomp-bpf/errorcode.h"
 
 #include <errno.h>
 
 #include "base/macros.h"
 #include "sandbox/linux/bpf_dsl/bpf_dsl.h"
 #include "sandbox/linux/bpf_dsl/policy.h"
 #include "sandbox/linux/bpf_dsl/policy_compiler.h"
 #include "sandbox/linux/seccomp-bpf/linux_seccomp.h"
 #include "sandbox/linux/seccomp-bpf/trap.h"
 #include "sandbox/linux/tests/unit_tests.h"
 
 namespace sandbox {
 
 namespace {
 
 class DummyPolicy : public bpf_dsl::Policy {
  public:
   DummyPolicy() {}
-  virtual ~DummyPolicy() {}
+  ~DummyPolicy() override {}
 
-  virtual bpf_dsl::ResultExpr EvaluateSyscall(int sysno) const override {
+  bpf_dsl::ResultExpr EvaluateSyscall(int sysno) const override {
     return bpf_dsl::Allow();
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DummyPolicy);
 };
 
 SANDBOX_TEST(ErrorCode, ErrnoConstructor) {
   ErrorCode e0;
   SANDBOX_ASSERT(e0.err() == SECCOMP_RET_INVALID);
@@ skipping 74 matching lines @@
   SANDBOX_ASSERT(e1.LessThan(e4));
   SANDBOX_ASSERT(e3.LessThan(e4));
   SANDBOX_ASSERT(e4.LessThan(e5));
   SANDBOX_ASSERT(!e4.LessThan(e6));
   SANDBOX_ASSERT(!e6.LessThan(e4));
 }
 
 }  // namespace
 
 }  // namespace sandbox