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

chrome/browser/chromeos/net/onc_utils.cc

Index: chrome/browser/chromeos/net/onc_utils.cc
diff --git a/chrome/browser/chromeos/net/onc_utils.cc b/chrome/browser/chromeos/net/onc_utils.cc
index be23fbf5735660cdc068fd6fe8dcbbccb86638d5..3c067f456f7bf80e207622400edb6885120257ae 100644
--- a/chrome/browser/chromeos/net/onc_utils.cc
+++ b/chrome/browser/chromeos/net/onc_utils.cc
@@ -154,10 +154,10 @@ class UserStringSubstitution : public chromeos::onc::StringSubstitution {
  public:
   explicit UserStringSubstitution(const user_manager::User* user)
       : user_(user) {}
-  virtual ~UserStringSubstitution() {}
+  ~UserStringSubstitution() override {}
 
-  virtual bool GetSubstitute(const std::string& placeholder,
-                             std::string* substitute) const override {
+  bool GetSubstitute(const std::string& placeholder,
+                     std::string* substitute) const override {
     if (placeholder == ::onc::substitutes::kLoginIDField)
       *substitute = user_->GetAccountName(false);
     else if (placeholder == ::onc::substitutes::kEmailField)