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

chrome/browser/task_manager/extension_information.cc

Index: chrome/browser/task_manager/extension_information.cc
diff --git a/chrome/browser/task_manager/extension_information.cc b/chrome/browser/task_manager/extension_information.cc
index 272b22c04d01e4fb078fed89cae4257597b28fc9..ab22d2368d03ded1d2d3a015a6b52a230f4f3f59 100644
--- a/chrome/browser/task_manager/extension_information.cc
+++ b/chrome/browser/task_manager/extension_information.cc
@@ -47,12 +47,12 @@ class ExtensionProcessResource : public RendererResource {
  public:
   explicit ExtensionProcessResource(const Extension* extension,
                                     content::RenderViewHost* render_view_host);
-  virtual ~ExtensionProcessResource();
+  ~ExtensionProcessResource() override;
 
   // Resource methods:
-  virtual base::string16 GetTitle() const override;
-  virtual gfx::ImageSkia GetIcon() const override;
-  virtual Type GetType() const override;
+  base::string16 GetTitle() const override;
+  gfx::ImageSkia GetIcon() const override;
+  Type GetType() const override;
 
  private:
   // Returns true if the associated extension has a background page.