Standardize usage of virtual/override/final specifiers.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index a735aff095f707f38d36f69c7fe8b78be89dc7c5..93973edc9cfcb271de1936a3c5b2154fc238a689 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -352,16 +352,16 @@ class RenderWidgetHostViewAura::EventFilterForPopupExit
     aura::Env::GetInstance()->AddPreTargetHandler(this);
   }
 
-  virtual ~EventFilterForPopupExit() {
+  ~EventFilterForPopupExit() override {
     aura::Env::GetInstance()->RemovePreTargetHandler(this);
   }
 
   // Overridden from ui::EventHandler
-  virtual void OnMouseEvent(ui::MouseEvent* event) override {
+  void OnMouseEvent(ui::MouseEvent* event) override {
     rwhva_->ApplyEventFilterForPopupExit(event);
   }
 
-  virtual void OnTouchEvent(ui::TouchEvent* event) override {
+  void OnTouchEvent(ui::TouchEvent* event) override {
     rwhva_->ApplyEventFilterForPopupExit(event);
   }
 
@@ -403,18 +403,16 @@ class RenderWidgetHostViewAura::WindowObserver : public aura::WindowObserver {
     view_->window_->AddObserver(this);
   }
 
-  virtual ~WindowObserver() {
-    view_->window_->RemoveObserver(this);
-  }
+  ~WindowObserver() override { view_->window_->RemoveObserver(this); }
 
   // Overridden from aura::WindowObserver:
-  virtual void OnWindowAddedToRootWindow(aura::Window* window) override {
+  void OnWindowAddedToRootWindow(aura::Window* window) override {
     if (window == view_->window_)
       view_->AddedToRootWindow();
   }
 
-  virtual void OnWindowRemovingFromRootWindow(aura::Window* window,
-                                              aura::Window* new_root) override {
+  void OnWindowRemovingFromRootWindow(aura::Window* window,
+                                      aura::Window* new_root) override {
     if (window == view_->window_)
       view_->RemovingFromRootWindow();
   }