Standardize usage of virtual/override/final specifiers.

components/nacl/loader/sandbox_linux/nacl_bpf_sandbox_linux.cc

 // Copyright 2013 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 "components/nacl/loader/sandbox_linux/nacl_bpf_sandbox_linux.h"
 
 #include "build/build_config.h"
 
 #if defined(USE_SECCOMP_BPF)
 
@@ skipping 20 matching lines @@
 namespace {
 
 using sandbox::bpf_dsl::Allow;
 using sandbox::bpf_dsl::Error;
 using sandbox::bpf_dsl::ResultExpr;
 
 class NaClBPFSandboxPolicy : public sandbox::bpf_dsl::Policy {
  public:
   NaClBPFSandboxPolicy()
       : baseline_policy_(content::GetBPFSandboxBaselinePolicy()) {}
-  virtual ~NaClBPFSandboxPolicy() {}
+  ~NaClBPFSandboxPolicy() override {}
 
-  virtual ResultExpr EvaluateSyscall(int system_call_number) const override;
-  virtual ResultExpr InvalidSyscall() const override {
+  ResultExpr EvaluateSyscall(int system_call_number) const override;
+  ResultExpr InvalidSyscall() const override {
     return baseline_policy_->InvalidSyscall();
   }
 
  private:
   scoped_ptr<sandbox::bpf_dsl::Policy> baseline_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(NaClBPFSandboxPolicy);
 };
 
 ResultExpr NaClBPFSandboxPolicy::EvaluateSyscall(int sysno) const {
@@ skipping 79 matching lines @@
       scoped_ptr<sandbox::bpf_dsl::Policy>(new NaClBPFSandboxPolicy));
   if (sandbox_is_initialized) {
     RunSandboxSanityChecks();
     return true;
   }
 #endif  // defined(USE_SECCOMP_BPF)
   return false;
 }
 
 }  // namespace nacl