Remove ENABLE(FILE_SYSTEM) compile-time flag.

Source/WebCore/inspector/InspectorFrontendHost.h

 /*
  * Copyright (C) 2007 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
@@ skipping 70 matching lines @@
     // Called from [Custom] implementations.
     void showContextMenu(Event*, const Vector<ContextMenuItem>& items);
     void sendMessageToBackend(const String& message);
 
     String loadResourceSynchronously(const String& url);
 
     bool supportsFileSystems();
     void requestFileSystems();
     void addFileSystem();
     void removeFileSystem(const String& fileSystemPath);
-#if ENABLE(FILE_SYSTEM)
     PassRefPtr<DOMFileSystem> isolatedFileSystem(const String& fileSystemName, const String& rootURL);
-#endif
 
     bool isUnderTest();
 
     bool canInspectWorkers();
     bool canSaveAs();
     String hiddenPanels();
 
 private:
 #if ENABLE(CONTEXT_MENUS)
     friend class FrontendMenuProvider;
 #endif
     InspectorFrontendHost(InspectorFrontendClient* client, Page* frontendPage);
 
     InspectorFrontendClient* m_client;
     Page* m_frontendPage;
 #if ENABLE(CONTEXT_MENUS)
     FrontendMenuProvider* m_menuProvider;
 #endif
 };
 
 } // namespace WebCore
 
 #endif // !defined(InspectorFrontendHost_h)