Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/ash/screenshot_taker.cc

Index: chrome/browser/ui/ash/screenshot_taker.cc
diff --git a/chrome/browser/ui/ash/screenshot_taker.cc b/chrome/browser/ui/ash/screenshot_taker.cc
index f0e91c64c475da453cefb86e53b3c1fbfcb71921..0f6dfd760d101102dfff70433ed8e791377ade0f 100644
--- a/chrome/browser/ui/ash/screenshot_taker.cc
+++ b/chrome/browser/ui/ash/screenshot_taker.cc
@@ -127,10 +127,10 @@ class ScreenshotTakerNotificationDelegate : public NotificationDelegate {
   }
 
   // Overridden from NotificationDelegate:
-  virtual void Display() override {}
-  virtual void Error() override {}
-  virtual void Close(bool by_user) override {}
-  virtual void Click() override {
+  void Display() override {}
+  void Error() override {}
+  void Close(bool by_user) override {}
+  void Click() override {
     if (!success_)
       return;
 #if defined(OS_CHROMEOS)
@@ -139,7 +139,7 @@ class ScreenshotTakerNotificationDelegate : public NotificationDelegate {
     // TODO(sschmitz): perhaps add similar action for Windows.
 #endif
   }
-  virtual void ButtonClick(int button_index) override {
+  void ButtonClick(int button_index) override {
     DCHECK(success_ && button_index == 0);
 
     // To avoid keeping the screenshot image on memory, it will re-read the
@@ -158,13 +158,11 @@ class ScreenshotTakerNotificationDelegate : public NotificationDelegate {
         FROM_HERE, base::Bind(
             &ReadFileAndCopyToClipboardLocal, screenshot_path_));
   }
-  virtual bool HasClickedListener() override { return success_; }
-  virtual std::string id() const override {
-    return std::string(kNotificationId);
-  }
+  bool HasClickedListener() override { return success_; }
+  std::string id() const override { return std::string(kNotificationId); }
 
  private:
-  virtual ~ScreenshotTakerNotificationDelegate() {}
+  ~ScreenshotTakerNotificationDelegate() override {}
 
   const bool success_;
   Profile* profile_;