Remove ENABLE(FILE_SYSTEM) compile-time flag.

Source/WebCore/Modules/filesystem/WorkerContextFileSystem.idl

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 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. 
  *
  */
 
 [
-    Conditional=FILE_SYSTEM,
     Supplemental=WorkerContext
 ] interface WorkerContextFileSystem {
     const unsigned short TEMPORARY = 0;
     const unsigned short PERSISTENT = 1;
 
     [V8EnabledAtRuntime=FileSystem] void webkitRequestFileSystem(unsigned short type, long long size, [Callback, Optional] FileSystemCallback successCallback, [Callback, Optional] ErrorCallback errorCallback);
     [V8EnabledAtRuntime=FileSystem] DOMFileSystemSync webkitRequestFileSystemSync(unsigned short type, long long size) raises (FileException);
     [V8EnabledAtRuntime=FileSystem] void webkitResolveLocalFileSystemURL(DOMString url, [Callback] EntryCallback successCallback, [Callback, Optional] ErrorCallback errorCallback);
     [V8EnabledAtRuntime=FileSystem] EntrySync webkitResolveLocalFileSystemSyncURL(DOMString url) raises (FileException);
 
     [V8EnabledAtRuntime=FileSystem] attribute FileErrorConstructor FileError;
     [V8EnabledAtRuntime=FileSystem] attribute FileExceptionConstructor FileException;
 };