Update {virtual,override} to follow C++11 style in sandbox.

sandbox/linux/seccomp-bpf/bpf_tester_compatibility_delegate.h

 // 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.
 
 #ifndef SANDBOX_LINUX_SECCOMP_BPF_BPF_TESTER_COMPATIBILITY_DELEGATE_H_
 #define SANDBOX_LINUX_SECCOMP_BPF_BPF_TESTER_COMPATIBILITY_DELEGATE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf_test_runner.h"
 
 namespace sandbox {
 
 // This templated class allows building a BPFTesterDelegate from a
 // deprecated-style BPF policy (that is a SyscallEvaluator function pointer,
 // instead of a SandboxBPFPolicy class), specified in |policy_function| and a
 // function pointer to a test in |test_function|.
 // This allows both the policy and the test function to take a pointer to an
 // object of type "Aux" as a parameter. This is used to implement the BPF_TEST
 // macro and should generally not be used directly.
 template <class Policy, class Aux>
 class BPFTesterCompatibilityDelegate : public BPFTesterDelegate {
  public:
   typedef void (*TestFunction)(Aux*);
 
   explicit BPFTesterCompatibilityDelegate(TestFunction test_function)
       : aux_(), test_function_(test_function) {}
 
-  virtual ~BPFTesterCompatibilityDelegate() {}
+  ~BPFTesterCompatibilityDelegate() override {}
 
-  virtual scoped_ptr<bpf_dsl::Policy> GetSandboxBPFPolicy() override {
+  scoped_ptr<bpf_dsl::Policy> GetSandboxBPFPolicy() override {
     // The current method is guaranteed to only run in the child process
     // running the test. In this process, the current object is guaranteed
     // to live forever. So it's ok to pass aux_pointer_for_policy_ to
     // the policy, which could in turn pass it to the kernel via Trap().
     return scoped_ptr<bpf_dsl::Policy>(new Policy(&aux_));
   }
 
-  virtual void RunTestFunction() override {
+  void RunTestFunction() override {
     // Run the actual test.
     // The current object is guaranteed to live forever in the child process
     // where this will run.
     test_function_(&aux_);
   }
 
  private:
   Aux aux_;
   TestFunction test_function_;
 
   DISALLOW_COPY_AND_ASSIGN(BPFTesterCompatibilityDelegate);
 };
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_SECCOMP_BPF_BPF_TESTER_COMPATIBILITY_DELEGATE_H_