Fix virtual/override/final usage in Source/modules/.

Source/modules/filesystem/DOMFileSystemSync.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 90 matching lines @@
             , m_code(0)
         {
         }
     };
 
     static PassOwnPtr<AsyncFileSystemCallbacks> create(CreateFileResult* result, const String& name, const KURL& url, FileSystemType type)
     {
         return adoptPtr(static_cast<AsyncFileSystemCallbacks*>(new CreateFileHelper(result, name, url, type)));
     }
 
-    virtual void didFail(int code) override
+    void didFail(int code) override
     {
         m_result->m_failed = true;
         m_result->m_code = code;
     }
 
-    virtual ~CreateFileHelper()
+    ~CreateFileHelper() override
     {
     }
 
-    virtual void didCreateSnapshotFile(const FileMetadata& metadata, PassRefPtr<BlobDataHandle> snapshot) override
+    void didCreateSnapshotFile(const FileMetadata& metadata, PassRefPtr<BlobDataHandle> snapshot) override
     {
         // We can't directly use the snapshot blob data handle because the content type on it hasn't been set.
         // The |snapshot| param is here to provide a a chain of custody thru thread bridging that is held onto until
         // *after* we've coined a File with a new handle that has the correct type set on it. This allows the
         // blob storage system to track when a temp file can and can't be safely deleted.
 
         m_result->m_file = DOMFileSystemBase::createFile(metadata, m_url, m_type, m_name);
     }
 
-    virtual bool shouldBlockUntilCompletion() const override
+    bool shouldBlockUntilCompletion() const override
     {
         return true;
     }
 
 private:
     CreateFileHelper(CreateFileResult* result, const String& name, const KURL& url, FileSystemType type)
         : m_result(result)
         , m_name(name)
         , m_url(url)
         , m_type(type)
@@ skipping 22 matching lines @@
 
 namespace {
 
 class ReceiveFileWriterCallback final : public FileWriterBaseCallback {
 public:
     static ReceiveFileWriterCallback* create()
     {
         return new ReceiveFileWriterCallback();
     }
 
-    virtual void handleEvent(FileWriterBase*) override
+    void handleEvent(FileWriterBase*) override
     {
     }
 
 private:
     ReceiveFileWriterCallback()
     {
     }
 };
 
 class LocalErrorCallback final : public ErrorCallback {
 public:
     static LocalErrorCallback* create(FileError::ErrorCode& errorCode)
     {
         return new LocalErrorCallback(errorCode);
     }
 
-    virtual void handleEvent(FileError* error) override
+    void handleEvent(FileError* error) override
     {
         ASSERT(error->code() != FileError::OK);
         m_errorCode = error->code();
     }
 
 private:
     explicit LocalErrorCallback(FileError::ErrorCode& errorCode)
         : m_errorCode(errorCode)
     {
     }
@@ skipping 23 matching lines @@
     return fileWriter;
 }
 
 DEFINE_TRACE(DOMFileSystemSync)
 {
     DOMFileSystemBase::trace(visitor);
     visitor->trace(m_rootEntry);
 }
 
 }