Standardize usage of virtual/override/final in base/

base/file_version_info_mac.h

Index: base/file_version_info_mac.h
diff --git a/base/file_version_info_mac.h b/base/file_version_info_mac.h
index 50a04ebec1caeec2d5a3ffe7a2feb7208e27483e..a18dbbdbefb8a1fa9a16c523625bec777e2c9f2e 100644
--- a/base/file_version_info_mac.h
+++ b/base/file_version_info_mac.h
@@ -19,26 +19,26 @@ class NSBundle;
 class FileVersionInfoMac : public FileVersionInfo {
  public:
   explicit FileVersionInfoMac(NSBundle *bundle);
-  virtual ~FileVersionInfoMac();
+  ~FileVersionInfoMac() override;
 
   // Accessors to the different version properties.
   // Returns an empty string if the property is not found.
-  virtual base::string16 company_name() override;
-  virtual base::string16 company_short_name() override;
-  virtual base::string16 product_name() override;
-  virtual base::string16 product_short_name() override;
-  virtual base::string16 internal_name() override;
-  virtual base::string16 product_version() override;
-  virtual base::string16 private_build() override;
-  virtual base::string16 special_build() override;
-  virtual base::string16 comments() override;
-  virtual base::string16 original_filename() override;
-  virtual base::string16 file_description() override;
-  virtual base::string16 file_version() override;
-  virtual base::string16 legal_copyright() override;
-  virtual base::string16 legal_trademarks() override;
-  virtual base::string16 last_change() override;
-  virtual bool is_official_build() override;
+  base::string16 company_name() override;
+  base::string16 company_short_name() override;
+  base::string16 product_name() override;
+  base::string16 product_short_name() override;
+  base::string16 internal_name() override;
+  base::string16 product_version() override;
+  base::string16 private_build() override;
+  base::string16 special_build() override;
+  base::string16 comments() override;
+  base::string16 original_filename() override;
+  base::string16 file_description() override;
+  base::string16 file_version() override;
+  base::string16 legal_copyright() override;
+  base::string16 legal_trademarks() override;
+  base::string16 last_change() override;
+  bool is_official_build() override;
 
  private:
   // Returns a base::string16 value for a property name.