Update virtual/final usage in url/.

url/url_canon_stdstring.h

 // 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.
 
 #ifndef URL_URL_CANON_STDSTRING_H_
 #define URL_URL_CANON_STDSTRING_H_
 
 // This header file defines a canonicalizer output method class for STL
 // strings. Because the canonicalizer tries not to be dependent on the STL,
 // we have segregated it here.
@@ skipping 18 matching lines @@
 // unused space at the end because we make the string very big to start out
 // with (by |initial_size|). This ends up being important because resize
 // operations are slow, and because the base class needs to write directly
 // into the buffer.
 //
 // Therefore, the user should call Complete() before using the string that
 // this class wrote into.
 class URL_EXPORT StdStringCanonOutput : public CanonOutput {
  public:
   StdStringCanonOutput(std::string* str);
-  virtual ~StdStringCanonOutput();
+  ~StdStringCanonOutput() override;
 
   // Must be called after writing has completed but before the string is used.
   void Complete();
 
-  virtual void Resize(int sz) override;
+  void Resize(int sz) override;
 
  protected:
   std::string* str_;
 };
 
 // An extension of the Replacements class that allows the setters to use
 // standard strings.
 //
 // The strings passed as arguments are not copied and must remain valid until
 // this class goes out of scope.
@@ skipping 22 matching lines @@
     this->SetQuery(s.data(), Component(0, static_cast<int>(s.length())));
   }
   void SetRefStr(const STR& s) {
     this->SetRef(s.data(), Component(0, static_cast<int>(s.length())));
   }
 };
 
 }  // namespace url
 
 #endif  // URL_URL_CANON_STDSTRING_H_