Standardize usage of virtual/override/final in storage/

storage/browser/fileapi/local_file_util.cc

Index: storage/browser/fileapi/local_file_util.cc
diff --git a/storage/browser/fileapi/local_file_util.cc b/storage/browser/fileapi/local_file_util.cc
index 5f3be4f1f464ff740f544506d416aeba68cf329c..27a130817c388140953e7d273c77a0231329411d 100644
--- a/storage/browser/fileapi/local_file_util.cc
+++ b/storage/browser/fileapi/local_file_util.cc
@@ -32,12 +32,12 @@ class LocalFileEnumerator : public FileSystemFileUtil::AbstractFileEnumerator {
         virtual_root_path_(virtual_root_path) {
   }
 
-  virtual ~LocalFileEnumerator() {}
+  ~LocalFileEnumerator() override {}
 
-  virtual base::FilePath Next() override;
-  virtual int64 Size() override;
-  virtual base::Time LastModifiedTime() override;
-  virtual bool IsDirectory() override;
+  base::FilePath Next() override;
+  int64 Size() override;
+  base::Time LastModifiedTime() override;
+  bool IsDirectory() override;
 
  private:
   base::FileEnumerator file_enum_;