Standardize usage of virtual/override/final in chrome/browser/extensions/

chrome/browser/extensions/install_signer.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 "chrome/browser/extensions/install_signer.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/json/json_reader.h"
@@ skipping 256 matching lines @@
   return verifier.VerifyFinal();
 }
 
 
 class InstallSigner::FetcherDelegate : public net::URLFetcherDelegate {
  public:
   explicit FetcherDelegate(const base::Closure& callback)
       : callback_(callback) {
   }
 
-  virtual ~FetcherDelegate() {
-  }
+  ~FetcherDelegate() override {}
 
-  virtual void OnURLFetchComplete(const net::URLFetcher* source) override {
+  void OnURLFetchComplete(const net::URLFetcher* source) override {
     callback_.Run();
   }
 
  private:
   base::Closure callback_;
   DISALLOW_COPY_AND_ASSIGN(FetcherDelegate);
 };
 
 // static
 ExtensionIdSet InstallSigner::GetForcedNotFromWebstore() {
@@ skipping 210 matching lines @@
     if (!verified)
       result.reset();
   }
 
   if (!callback_.is_null())
     callback_.Run(result.Pass());
 }
 
 
 }  // namespace extensions