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

chrome/browser/ui/webui/crashes_ui.cc

Index: chrome/browser/ui/webui/crashes_ui.cc
diff --git a/chrome/browser/ui/webui/crashes_ui.cc b/chrome/browser/ui/webui/crashes_ui.cc
index 18d4fe908bcc4cc007dcaf9fa4beda7cf29f1d3e..ba6a58ea335d13773d1f7b857b7f5a5cf340b902 100644
--- a/chrome/browser/ui/webui/crashes_ui.cc
+++ b/chrome/browser/ui/webui/crashes_ui.cc
@@ -72,13 +72,13 @@ class CrashesDOMHandler : public WebUIMessageHandler,
                           public CrashUploadList::Delegate {
  public:
   CrashesDOMHandler();
-  virtual ~CrashesDOMHandler();
+  ~CrashesDOMHandler() override;
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
   // CrashUploadList::Delegate implemenation.
-  virtual void OnUploadListAvailable() override;
+  void OnUploadListAvailable() override;
 
  private:
   // Asynchronously fetches the list of crashes. Called from JS.