Make ExceptionCode be an enum that does not encode the "code" property

Source/core/dom/DOMCoreException.h

 /*
  * Copyright (C) 2007, 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
@@ skipping 16 matching lines @@
  */
 
 #ifndef DOMCoreException_h
 #define DOMCoreException_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/ExceptionBase.h"
 
 namespace WebCore {
 
+// FIXME: This should be private once IDBDatabaseException is gone.
+enum {
+    IndexSizeErrorLegacyCode = 1,
+    HierarchyRequestErrorLegacyCode = 3,
+    WrongDocumentErrorLegacyCode = 4,
+    InvalidCharacterErrorLegacyCode = 5,
+    NoModificationAllowedErrorLegacyCode = 7,
+    NotFoundErrorLegacyCode = 8,
+    NotSupportedErrorLegacyCode = 9,
+    InuseAttributeErrorLegacyCode = 10, // Historical. Only used in setAttributeNode etc which have been removed from the DOM specs.
+
+    // Introduced in DOM Level 2:
+    InvalidStateErrorLegacyCode = 11,
+    SyntaxErrorLegacyCode = 12,
+    InvalidModificationErrorLegacyCode = 13,
+    NamespaceErrorLegacyCode = 14,
+    InvalidAccessErrorLegacyCode = 15,
+
+    // Introduced in DOM Level 3:
+    TypeMismatchErrorLegacyCode = 17, // Historical; use TypeError instead
+
+    // XMLHttpRequest extension:
+    SecurityErrorLegacyCode = 18,
+
+    // Others introduced in HTML5:
+    NetworkErrorLegacyCode = 19,
+    AbortErrorLegacyCode = 20,
+    UrlMismatchErrorLegacyCode = 21,
+    QuotaExceededErrorLegacyCode = 22,
+    TimeoutErrorLegacyCode = 23,
+    InvalidNodeTypeErrorLegacyCode = 24,
+    DataCloneErrorLegacyCode = 25
+};
+
 class DOMCoreException : public ExceptionBase, public ScriptWrappable {
 public:
     static PassRefPtr<DOMCoreException> create(const ExceptionCodeDescription& description)
     {
         return adoptRef(new DOMCoreException(description));
     }
 
     static bool initializeDescription(ExceptionCode, ExceptionCodeDescription*);
+    static int getLegacyErrorCode(ExceptionCode);
 
 private:
     explicit DOMCoreException(const ExceptionCodeDescription& description)
         : ExceptionBase(description)
     {
         ScriptWrappable::init(this);
     }
 };
 
 } // namespace WebCore
 
 #endif // DOMCoreException_h