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

chrome/browser/extensions/api/tab_capture/tab_capture_registry.cc

Index: chrome/browser/extensions/api/tab_capture/tab_capture_registry.cc
diff --git a/chrome/browser/extensions/api/tab_capture/tab_capture_registry.cc b/chrome/browser/extensions/api/tab_capture/tab_capture_registry.cc
index 0ea0233fb0597eae9339f9fd45595c82c6bde17c..f83858a094ade26f8d98fd01c97c1154c2c901fc 100644
--- a/chrome/browser/extensions/api/tab_capture/tab_capture_registry.cc
+++ b/chrome/browser/extensions/api/tab_capture/tab_capture_registry.cc
@@ -45,7 +45,7 @@ class TabCaptureRegistry::LiveRequest : public content::WebContentsObserver {
     DCHECK(registry_);
   }
 
-  virtual ~LiveRequest() {}
+  ~LiveRequest() override {}
 
   // Accessors.
   const std::string& extension_id() const {
@@ -96,25 +96,25 @@ class TabCaptureRegistry::LiveRequest : public content::WebContentsObserver {
   }
 
  protected:
-  virtual void DidShowFullscreenWidget(int routing_id) override {
+  void DidShowFullscreenWidget(int routing_id) override {
     is_fullscreened_ = true;
     if (capture_state_ == tab_capture::TAB_CAPTURE_STATE_ACTIVE)
       registry_->DispatchStatusChangeEvent(this);
   }
 
-  virtual void DidDestroyFullscreenWidget(int routing_id) override {
+  void DidDestroyFullscreenWidget(int routing_id) override {
     is_fullscreened_ = false;
     if (capture_state_ == tab_capture::TAB_CAPTURE_STATE_ACTIVE)
       registry_->DispatchStatusChangeEvent(this);
   }
 
-  virtual void DidToggleFullscreenModeForTab(bool entered_fullscreen) override {
+  void DidToggleFullscreenModeForTab(bool entered_fullscreen) override {
     is_fullscreened_ = entered_fullscreen;
     if (capture_state_ == tab_capture::TAB_CAPTURE_STATE_ACTIVE)
       registry_->DispatchStatusChangeEvent(this);
   }
 
-  virtual void WebContentsDestroyed() override {
+  void WebContentsDestroyed() override {
     registry_->KillRequest(this);  // Deletes |this|.
   }