Standardize usage of virtual/override/final in chrome/

chrome/common/extensions/api/storage/storage_schema_manifest_handler.h

Index: chrome/common/extensions/api/storage/storage_schema_manifest_handler.h
diff --git a/chrome/common/extensions/api/storage/storage_schema_manifest_handler.h b/chrome/common/extensions/api/storage/storage_schema_manifest_handler.h
index e7553a13fb3030703ceee7579d8425c17d817b83..c698e2dd199261c0f6287467f84031882f2f241d 100644
--- a/chrome/common/extensions/api/storage/storage_schema_manifest_handler.h
+++ b/chrome/common/extensions/api/storage/storage_schema_manifest_handler.h
@@ -18,7 +18,7 @@ namespace extensions {
 class StorageSchemaManifestHandler : public ManifestHandler {
  public:
   StorageSchemaManifestHandler();
-  virtual ~StorageSchemaManifestHandler();
+  ~StorageSchemaManifestHandler() override;
 
 #if defined(ENABLE_CONFIGURATION_POLICY)
   // Returns the managed storage schema defined for |extension|.
@@ -31,11 +31,11 @@ class StorageSchemaManifestHandler : public ManifestHandler {
 
  private:
   // ManifestHandler implementation:
-  virtual bool Parse(Extension* extension, base::string16* error) override;
-  virtual bool Validate(const Extension* extension,
-                        std::string* error,
-                        std::vector<InstallWarning>* warnings) const override;
-  virtual const std::vector<std::string> Keys() const override;
+  bool Parse(Extension* extension, base::string16* error) override;
+  bool Validate(const Extension* extension,
+                std::string* error,
+                std::vector<InstallWarning>* warnings) const override;
+  const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(StorageSchemaManifestHandler);
 };