Standardize usage of virtual/override/final in extensions/

extensions/browser/api/storage/settings_storage_quota_enforcer.h

Index: extensions/browser/api/storage/settings_storage_quota_enforcer.h
diff --git a/extensions/browser/api/storage/settings_storage_quota_enforcer.h b/extensions/browser/api/storage/settings_storage_quota_enforcer.h
index bbf7482f07700d424f2c335ac469bb774deca638..297f9e1089a2525f0176af02a06067001e2b8205 100644
--- a/extensions/browser/api/storage/settings_storage_quota_enforcer.h
+++ b/extensions/browser/api/storage/settings_storage_quota_enforcer.h
@@ -28,26 +28,25 @@ class SettingsStorageQuotaEnforcer : public ValueStore {
 
   SettingsStorageQuotaEnforcer(const Limits& limits, ValueStore* delegate);
 
-  virtual ~SettingsStorageQuotaEnforcer();
+  ~SettingsStorageQuotaEnforcer() override;
 
   // ValueStore implementation.
-  virtual size_t GetBytesInUse(const std::string& key) override;
-  virtual size_t GetBytesInUse(const std::vector<std::string>& keys) override;
-  virtual size_t GetBytesInUse() override;
-  virtual ReadResult Get(const std::string& key) override;
-  virtual ReadResult Get(const std::vector<std::string>& keys) override;
-  virtual ReadResult Get() override;
-  virtual WriteResult Set(
-      WriteOptions options,
-      const std::string& key,
-      const base::Value& value) override;
-  virtual WriteResult Set(
-      WriteOptions options, const base::DictionaryValue& values) override;
-  virtual WriteResult Remove(const std::string& key) override;
-  virtual WriteResult Remove(const std::vector<std::string>& keys) override;
-  virtual WriteResult Clear() override;
-  virtual bool Restore() override;
-  virtual bool RestoreKey(const std::string& key) override;
+  size_t GetBytesInUse(const std::string& key) override;
+  size_t GetBytesInUse(const std::vector<std::string>& keys) override;
+  size_t GetBytesInUse() override;
+  ReadResult Get(const std::string& key) override;
+  ReadResult Get(const std::vector<std::string>& keys) override;
+  ReadResult Get() override;
+  WriteResult Set(WriteOptions options,
+                  const std::string& key,
+                  const base::Value& value) override;
+  WriteResult Set(WriteOptions options,
+                  const base::DictionaryValue& values) override;
+  WriteResult Remove(const std::string& key) override;
+  WriteResult Remove(const std::vector<std::string>& keys) override;
+  WriteResult Clear() override;
+  bool Restore() override;
+  bool RestoreKey(const std::string& key) override;
 
   ValueStore* get_delegate_for_test() { return delegate_.get(); }