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

chrome/browser/extensions/zipfile_installer_unittest.cc

 // Copyright 2014 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 "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 24 matching lines @@
 namespace {
 
 struct MockExtensionRegistryObserver : public ExtensionRegistryObserver {
   void WaitForInstall() {
     scoped_refptr<content::MessageLoopRunner> runner =
         new content::MessageLoopRunner;
     quit_closure_ = runner->QuitClosure();
     runner->Run();
   }
 
-  virtual void OnExtensionWillBeInstalled(
-      content::BrowserContext* browser_context,
-      const Extension* extension,
-      bool is_update,
-      bool from_ephemeral,
-      const std::string& old_name) override {
+  void OnExtensionWillBeInstalled(content::BrowserContext* browser_context,
+                                  const Extension* extension,
+                                  bool is_update,
+                                  bool from_ephemeral,
+                                  const std::string& old_name) override {
     last_extension_installed = extension->id();
     quit_closure_.Run();
   }
 
   std::string last_extension_installed;
   base::Closure quit_closure_;
 };
 
 }  // namespace
 
@@ skipping 67 matching lines @@
   RunInstaller("good.zip");
 }
 
 TEST_F(ZipFileInstallerTest, ZipWithPublicKey) {
   RunInstaller("public_key.zip");
   const char kIdForPublicKey[] = "ikppjpenhoddphklkpdfdfdabbakkpal";
   EXPECT_EQ(observer_.last_extension_installed, kIdForPublicKey);
 }
 
 }  // namespace extensions