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

chrome/browser/extensions/crx_installer.h

Index: chrome/browser/extensions/crx_installer.h
diff --git a/chrome/browser/extensions/crx_installer.h b/chrome/browser/extensions/crx_installer.h
index 303889be96935f6c92f4623e73e4f379b9426351..bb9083ebd99046c251fc30f2c1e92962645d4353 100644
--- a/chrome/browser/extensions/crx_installer.h
+++ b/chrome/browser/extensions/crx_installer.h
@@ -108,8 +108,8 @@ class CrxInstaller
   void InstallWebApp(const WebApplicationInfo& web_app);
 
   // Overridden from ExtensionInstallPrompt::Delegate:
-  virtual void InstallUIProceed() override;
-  virtual void InstallUIAbort(bool user_initiated) override;
+  void InstallUIProceed() override;
+  void InstallUIAbort(bool user_initiated) override;
 
   int creation_flags() const { return creation_flags_; }
   void set_creation_flags(int val) { creation_flags_ = val; }
@@ -209,7 +209,7 @@ class CrxInstaller
   CrxInstaller(base::WeakPtr<ExtensionService> service_weak,
                scoped_ptr<ExtensionInstallPrompt> client,
                const WebstoreInstaller::Approval* approval);
-  virtual ~CrxInstaller();
+  ~CrxInstaller() override;
 
   // Converts the source user script to an extension.
   void ConvertUserScriptOnFileThread();
@@ -222,12 +222,12 @@ class CrxInstaller
   CrxInstallerError AllowInstall(const Extension* extension);
 
   // SandboxedUnpackerClient
-  virtual void OnUnpackFailure(const base::string16& error_message) override;
-  virtual void OnUnpackSuccess(const base::FilePath& temp_dir,
-                               const base::FilePath& extension_dir,
-                               const base::DictionaryValue* original_manifest,
-                               const Extension* extension,
-                               const SkBitmap& install_icon) override;
+  void OnUnpackFailure(const base::string16& error_message) override;
+  void OnUnpackSuccess(const base::FilePath& temp_dir,
+                       const base::FilePath& extension_dir,
+                       const base::DictionaryValue* original_manifest,
+                       const Extension* extension,
+                       const SkBitmap& install_icon) override;
 
   // Called on the UI thread to start the requirements, policy and blacklist
   // checks on the extension.