Remove the ENABLE_SQL_DATABASE compile-time flag.

Source/WebCore/Modules/webdatabase/DatabaseBackendSync.h

 /*
  * Copyright (C) 2013 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 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 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
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  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
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 #ifndef DatabaseBackendSync_h
 #define DatabaseBackendSync_h
 
-#if ENABLE(SQL_DATABASE)
-
 #include "DatabaseBackendBase.h"
 #include <wtf/text/WTFString.h>
 
 namespace WebCore {
 
 class DatabaseServer;
 
 // FIXME: This implementation of DatabaseBackendSync is only a place holder
 // for the split out of the DatabaseSync backend to be done later. This
 // place holder is needed to allow other code that need to reference the
 // DatabaseBackendSync to do so before the proper backend split is
 // available. This should be replaced with the actual implementation later.
 
 class DatabaseBackendSync : public DatabaseBackendBase {
 public:
     virtual ~DatabaseBackendSync();
 
     virtual bool openAndVerifyVersion(bool setVersionInNewDatabase, DatabaseError&, String& errorMessage);
 
 protected:
     DatabaseBackendSync(PassRefPtr<DatabaseBackendContext>, const String& name, const String& expectedVersion, const String& displayName, unsigned long estimatedSize);
 
     friend class DatabaseServer;
 };
 
 } // namespace WebCore
 
-#endif // ENABLE(SQL_DATABASE)
-
 #endif // DatabaseBackendSync_h