Remove ENABLE(FILE_SYSTEM) compile-time flag.

Source/WebCore/Modules/filesystem/DOMFileSystemSync.h

 /*
  * 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 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DOMFileSystemSync_h
 #define DOMFileSystemSync_h
 
-#if ENABLE(FILE_SYSTEM)
-
 #include "DOMFileSystemBase.h"
 
 namespace WebCore {
 
 class DirectoryEntrySync;
 class File;
 class FileEntrySync;
 class FileWriterSync;
 
 typedef int ExceptionCode;
@@ skipping 13 matching lines @@
 
     PassRefPtr<File> createFile(const FileEntrySync*, ExceptionCode&);
     PassRefPtr<FileWriterSync> createWriter(const FileEntrySync*, ExceptionCode&);
 
 private:
     DOMFileSystemSync(ScriptExecutionContext*, const String& name, FileSystemType, const KURL& rootURL, PassOwnPtr<AsyncFileSystem>);
 };
 
 }
 
-#endif // ENABLE(FILE_SYSTEM)
-
 #endif // DOMFileSystemSync_h