Standardize usage of virtual/override/final in extensions/

extensions/browser/api/web_request/upload_data_presenter.h

Index: extensions/browser/api/web_request/upload_data_presenter.h
diff --git a/extensions/browser/api/web_request/upload_data_presenter.h b/extensions/browser/api/web_request/upload_data_presenter.h
index 2b249586e3126736383e7622ba4a0bcc4c579157..54f7f159d6582c5da79031e6b7cd46dd96da18f6 100644
--- a/extensions/browser/api/web_request/upload_data_presenter.h
+++ b/extensions/browser/api/web_request/upload_data_presenter.h
@@ -69,12 +69,12 @@ class UploadDataPresenter {
 class RawDataPresenter : public UploadDataPresenter {
  public:
   RawDataPresenter();
-  virtual ~RawDataPresenter();
+  ~RawDataPresenter() override;
 
   // Implementation of UploadDataPresenter.
-  virtual void FeedNext(const net::UploadElementReader& reader) override;
-  virtual bool Succeeded() override;
-  virtual scoped_ptr<base::Value> Result() override;
+  void FeedNext(const net::UploadElementReader& reader) override;
+  bool Succeeded() override;
+  scoped_ptr<base::Value> Result() override;
 
  private:
   void FeedNextBytes(const char* bytes, size_t size);
@@ -99,12 +99,12 @@ class RawDataPresenter : public UploadDataPresenter {
 class ParsedDataPresenter : public UploadDataPresenter {
  public:
   explicit ParsedDataPresenter(const net::URLRequest& request);
-  virtual ~ParsedDataPresenter();
+  ~ParsedDataPresenter() override;
 
   // Implementation of UploadDataPresenter.
-  virtual void FeedNext(const net::UploadElementReader& reader) override;
-  virtual bool Succeeded() override;
-  virtual scoped_ptr<base::Value> Result() override;
+  void FeedNext(const net::UploadElementReader& reader) override;
+  bool Succeeded() override;
+  scoped_ptr<base::Value> Result() override;
 
   // Allows to create ParsedDataPresenter without the URLRequest. Uses the
   // parser for "application/x-www-form-urlencoded" form encoding. Only use this