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

chrome/browser/extensions/external_pref_loader.h

Index: chrome/browser/extensions/external_pref_loader.h
diff --git a/chrome/browser/extensions/external_pref_loader.h b/chrome/browser/extensions/external_pref_loader.h
index ec64c7391d1ac8a022f7e5f3337952b96b18288c..96e4f5723e365ea3e2640a15c3a63561c37363be 100644
--- a/chrome/browser/extensions/external_pref_loader.h
+++ b/chrome/browser/extensions/external_pref_loader.h
@@ -35,12 +35,12 @@ class ExternalPrefLoader : public ExternalLoader {
   // extension files are resolved relative to this path.
   ExternalPrefLoader(int base_path_id, Options options);
 
-  virtual const base::FilePath GetBaseCrxFilePath() override;
+  const base::FilePath GetBaseCrxFilePath() override;
 
  protected:
-  virtual ~ExternalPrefLoader() {}
+  ~ExternalPrefLoader() override {}
 
-  virtual void StartLoading() override;
+  void StartLoading() override;
   bool IsOptionSet(Options option) {
     return (options_ & option) != 0;
   }
@@ -86,15 +86,15 @@ class ExternalTestingLoader : public ExternalLoader {
   ExternalTestingLoader(const std::string& json_data,
                         const base::FilePath& fake_base_path);
 
-  virtual const base::FilePath GetBaseCrxFilePath() override;
+  const base::FilePath GetBaseCrxFilePath() override;
 
  protected:
-  virtual void StartLoading() override;
+  void StartLoading() override;
 
  private:
   friend class base::RefCountedThreadSafe<ExternalLoader>;
 
-  virtual ~ExternalTestingLoader();
+  ~ExternalTestingLoader() override;
 
   base::FilePath fake_base_path_;
   scoped_ptr<base::DictionaryValue> testing_prefs_;