Clean up forward declarations in Source/modules

Source/modules/webdatabase/sqlite/SQLiteFileSystem.h

 /*
  * Copyright (C) 2009 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 20 matching lines @@
 #ifndef SQLiteFileSystem_h
 #define SQLiteFileSystem_h
 
 #include "wtf/Threading.h"
 #include "wtf/text/WTFString.h"
 
 struct sqlite3;
 
 namespace blink {
 
-class SQLiteDatabase;
-
 // A class that abstracts the file system related operations required
 // by the WebKit database code.
 class SQLiteFileSystem {
 public:
     // Registers a user-defined SQLite VFS.
     static void registerSQLiteVFS();
 
     // Opens a database file.
     //
     // filemame - The name of the database file.
     // database - The SQLite structure that represents the database stored
     //            in the given file.
     // forWebSQLDatabase - True, if and only if we're opening a Web SQL Database file.
     //                     Used by Chromium to determine if the DB file needs to be opened
     //                     using a custom VFS.
     static int openDatabase(const String& filename, sqlite3** database, bool forWebSQLDatabase);
 
 private:
     // do not instantiate this class
     SQLiteFileSystem();
 }; // class SQLiteFileSystem
 
 } // namespace blink
 
 #endif