Update from https://crrev.com/309717

sandbox/linux/seccomp-bpf/bpf_tests_unittest.cc

 // Copyright 2014 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/bpf_tests.h"
 
 #include <errno.h>
 #include <sys/ptrace.h>
 #include <sys/syscall.h>
 #include <sys/types.h>
@@ skipping 28 matching lines @@
   int value_;
   DISALLOW_COPY_AND_ASSIGN(FourtyTwo);
 };
 
 class EmptyClassTakingPolicy : public bpf_dsl::Policy {
  public:
   explicit EmptyClassTakingPolicy(FourtyTwo* fourty_two) {
     BPF_ASSERT(fourty_two);
     BPF_ASSERT(FourtyTwo::kMagicValue == fourty_two->value());
   }
-  virtual ~EmptyClassTakingPolicy() {}
+  ~EmptyClassTakingPolicy() override {}
 
-  virtual ResultExpr EvaluateSyscall(int sysno) const override {
+  ResultExpr EvaluateSyscall(int sysno) const override {
     DCHECK(SandboxBPF::IsValidSyscallNumber(sysno));
     return Allow();
   }
 };
 
 BPF_TEST(BPFTest,
          BPFAUXPointsToClass,
          EmptyClassTakingPolicy,
          FourtyTwo /* *BPF_AUX */) {
   // BPF_AUX should point to an instance of FourtyTwo.
@@ skipping 15 matching lines @@
     // Test polymorphism.
     scoped_ptr<BPFTesterDelegate> simple_delegate(
         new BPFTesterCompatibilityDelegate<EmptyClassTakingPolicy, FourtyTwo>(
             DummyTestFunction));
   }
 }
 
 class EnosysPtracePolicy : public bpf_dsl::Policy {
  public:
   EnosysPtracePolicy() { my_pid_ = sys_getpid(); }
-  virtual ~EnosysPtracePolicy() {
+  ~EnosysPtracePolicy() override {
     // Policies should be able to bind with the process on which they are
     // created. They should never be created in a parent process.
     BPF_ASSERT_EQ(my_pid_, sys_getpid());
   }
 
-  virtual ResultExpr EvaluateSyscall(int system_call_number) const override {
+  ResultExpr EvaluateSyscall(int system_call_number) const override {
     CHECK(SandboxBPF::IsValidSyscallNumber(system_call_number));
     if (system_call_number == __NR_ptrace) {
       // The EvaluateSyscall function should run in the process that created
       // the current object.
       BPF_ASSERT_EQ(my_pid_, sys_getpid());
       return Error(ENOSYS);
     } else {
       return Allow();
     }
   }
 
  private:
   pid_t my_pid_;
   DISALLOW_COPY_AND_ASSIGN(EnosysPtracePolicy);
 };
 
 class BasicBPFTesterDelegate : public BPFTesterDelegate {
  public:
   BasicBPFTesterDelegate() {}
-  virtual ~BasicBPFTesterDelegate() {}
+  ~BasicBPFTesterDelegate() override {}
 
-  virtual scoped_ptr<bpf_dsl::Policy> GetSandboxBPFPolicy() override {
+  scoped_ptr<bpf_dsl::Policy> GetSandboxBPFPolicy() override {
     return scoped_ptr<bpf_dsl::Policy>(new EnosysPtracePolicy());
   }
-  virtual void RunTestFunction() override {
+  void RunTestFunction() override {
     errno = 0;
     int ret = ptrace(PTRACE_TRACEME, -1, NULL, NULL);
     BPF_ASSERT(-1 == ret);
     BPF_ASSERT(ENOSYS == errno);
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BasicBPFTesterDelegate);
 };
 
@@ skipping 15 matching lines @@
                  BPFDeathTestWithInlineTest,
                  DEATH_MESSAGE(kHelloMessage),
                  EnosysPtracePolicy) {
   LOG(ERROR) << kHelloMessage;
   _exit(1);
 }
 
 }  // namespace
 
 }  // namespace sandbox