Standardize usage of virtual/override/final specifiers.

content/common/sandbox_linux/sandbox_seccomp_bpf_linux.cc

Index: content/common/sandbox_linux/sandbox_seccomp_bpf_linux.cc
diff --git a/content/common/sandbox_linux/sandbox_seccomp_bpf_linux.cc b/content/common/sandbox_linux/sandbox_seccomp_bpf_linux.cc
index f98db20f50be7775c9a1199bdd5a327098226f48..54daf90eb984cb20cb1cf70e4087a0aae2996915 100644
--- a/content/common/sandbox_linux/sandbox_seccomp_bpf_linux.cc
+++ b/content/common/sandbox_linux/sandbox_seccomp_bpf_linux.cc
@@ -80,9 +80,9 @@ inline bool IsArchitectureArm() {
 class BlacklistDebugAndNumaPolicy : public SandboxBPFBasePolicy {
  public:
   BlacklistDebugAndNumaPolicy() {}
-  virtual ~BlacklistDebugAndNumaPolicy() {}
+  ~BlacklistDebugAndNumaPolicy() override {}
 
-  virtual ResultExpr EvaluateSyscall(int system_call_number) const override;
+  ResultExpr EvaluateSyscall(int system_call_number) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BlacklistDebugAndNumaPolicy);
@@ -98,9 +98,9 @@ ResultExpr BlacklistDebugAndNumaPolicy::EvaluateSyscall(int sysno) const {
 class AllowAllPolicy : public SandboxBPFBasePolicy {
  public:
   AllowAllPolicy() {}
-  virtual ~AllowAllPolicy() {}
+  ~AllowAllPolicy() override {}
 
-  virtual ResultExpr EvaluateSyscall(int system_call_number) const override;
+  ResultExpr EvaluateSyscall(int system_call_number) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AllowAllPolicy);