Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/settings.

chrome/browser/chromeos/settings/token_encryptor.h

Index: chrome/browser/chromeos/settings/token_encryptor.h
diff --git a/chrome/browser/chromeos/settings/token_encryptor.h b/chrome/browser/chromeos/settings/token_encryptor.h
index b9654ae25f9a1c4264edf97dd40ce48debd71e4f..057d34479b2ea04c519c8301f799ea8a842c7c56 100644
--- a/chrome/browser/chromeos/settings/token_encryptor.h
+++ b/chrome/browser/chromeos/settings/token_encryptor.h
@@ -38,11 +38,11 @@ class TokenEncryptor {
 class CryptohomeTokenEncryptor : public TokenEncryptor {
  public:
   explicit CryptohomeTokenEncryptor(const std::string& system_salt);
-  virtual ~CryptohomeTokenEncryptor();
+  ~CryptohomeTokenEncryptor() override;
 
   // TokenEncryptor overrides:
-  virtual std::string EncryptWithSystemSalt(const std::string& token) override;
-  virtual std::string DecryptWithSystemSalt(
+  std::string EncryptWithSystemSalt(const std::string& token) override;
+  std::string DecryptWithSystemSalt(
       const std::string& encrypted_token_hex) override;
 
  private: