Remove the remainings of the ENABLE_XSLT compile-time flag, following rev 148369.

Source/core/page/DOMWindow.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 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:
  * 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 543 matching lines @@
     attribute EventSourceConstructor EventSource; // Usable with new the operator
 
     // Mozilla has a separate XMLDocument object for XML documents. 
     // We just use Document for this.
     attribute DocumentConstructor XMLDocument;
     attribute DOMParserConstructor DOMParser;
     attribute XMLSerializerConstructor XMLSerializer;
     attribute XMLHttpRequestConstructor XMLHttpRequest; // Usable with the new operator
     attribute XMLHttpRequestUploadConstructor XMLHttpRequestUpload;
     attribute XMLHttpRequestExceptionConstructor XMLHttpRequestException;
-    [Conditional=XSLT] attribute XSLTProcessorConstructor XSLTProcessor; // Usable with the new operator
+    attribute XSLTProcessorConstructor XSLTProcessor; // Usable with the new operator
 
 #if defined(ENABLE_CHANNEL_MESSAGING) && ENABLE_CHANNEL_MESSAGING
     attribute MessagePortConstructor MessagePort;
     attribute MessageChannelConstructor MessageChannel; // Usable with the new operator
 #endif
 
     attribute DOMPluginConstructor Plugin;
     attribute DOMPluginArrayConstructor PluginArray;
 
     attribute DOMMimeTypeConstructor MimeType;
@@ skipping 178 matching lines @@
     attribute MutationRecordConstructor MutationRecord;
 
     [EnabledAtRuntime=mediaSource] attribute MediaSourceConstructor WebKitMediaSource;
     [EnabledAtRuntime=mediaSource] attribute SourceBufferConstructor WebKitSourceBuffer;
     [EnabledAtRuntime=mediaSource] attribute SourceBufferListConstructor WebKitSourceBufferList;
 
     // window.toString() requires special handling in V8
     [DoNotCheckSignature, DoNotCheckSecurity, Custom, NotEnumerable] DOMString toString();
 };