C++11 override style change for athena

athena/extensions/shell/extensions_delegate_impl.cc

Index: athena/extensions/shell/extensions_delegate_impl.cc
diff --git a/athena/extensions/shell/extensions_delegate_impl.cc b/athena/extensions/shell/extensions_delegate_impl.cc
index bd797f88a3a3fb3719a6e4c2a8da32ca63fb744a..f74aed9ffd6914bfaee7ad528d50e8e5d0705945 100644
--- a/athena/extensions/shell/extensions_delegate_impl.cc
+++ b/athena/extensions/shell/extensions_delegate_impl.cc
@@ -22,27 +22,27 @@ class ShellExtensionsDelegate : public ExtensionsDelegate {
     extensions::AppWindowClient::Set(&app_window_client_);
   }
 
-  virtual ~ShellExtensionsDelegate() { extensions::AppWindowClient::Set(NULL); }
+  ~ShellExtensionsDelegate() override { extensions::AppWindowClient::Set(NULL); }
 
  private:
   // ExtensionsDelegate:
-  virtual content::BrowserContext* GetBrowserContext() const override {
+  content::BrowserContext* GetBrowserContext() const override {
     return context_;
   }
-  virtual const extensions::ExtensionSet& GetInstalledExtensions() override {
+  const extensions::ExtensionSet& GetInstalledExtensions() override {
     shell_extensions_.Clear();
     if (extension_system_->extension().get())
       shell_extensions_.Insert(extension_system_->extension());
     return shell_extensions_;
   }
-  virtual bool LaunchApp(const std::string& app_id) override {
+  bool LaunchApp(const std::string& app_id) override {
     extension_system_->LaunchApp();
     return true;
   }
 
-  virtual bool UnloadApp(const std::string& app_id) override { return false; }
+  bool UnloadApp(const std::string& app_id) override { return false; }
 
-  virtual scoped_ptr<extensions::ExtensionInstallUI> CreateExtensionInstallUI()
+  scoped_ptr<extensions::ExtensionInstallUI> CreateExtensionInstallUI()
       override {
     return scoped_ptr<extensions::ExtensionInstallUI>();
   }